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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                              (AMENDMENT NO. ____)*

                 Charles River Laboratories International, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock; $.01 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    159864107
                           --------------------------
                                 (CUSIP Number)

                                December 31, 2003
--------------------------------------------------------------------------------
            (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [X]  Rule 13d-1(b)

     [ ]  Rule 13d-1(c)

     [ ]  Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

PERSONS WHO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED IN THIS FORM ARE
NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY VALID OMB CONTROL
NUMBER.

                                Page 1 of 6 pages


CUSIP No. 159864107
--------------------------------------------------------------------------------
      1.    Names of Reporting Persons.
            I.R.S. Identification Nos. of above persons (entities only).
H.A. Schupf & Co., LLC 06-1629202
--------------------------------------------------------------------------------
      2.    Check the Appropriate Box if a Member of a Group (See Instructions)

            (a)

            (b)
--------------------------------------------------------------------------------
      3.    SEC Use Only
--------------------------------------------------------------------------------
      4.    Citizenship or Place of Organization
            Delaware
--------------------------------------------------------------------------------
Number of         5. Sole Voting Power 3,197,470
Shares Bene-      --------------------------------------------------------------
ficially by       6. Shared Voting Power -0-
Owned by Each     --------------------------------------------------------------
Reporting         7. Sole Dispositive Power 3,197,470
Person With:      --------------------------------------------------------------
                  8. Shared Dispositive Power  -0-
--------------------------------------------------------------------------------
      9.    Aggregate Amount Beneficially Owned by Each Reporting Person
            3,197,470

      10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
            (See Instructions)

      11.   Percent of Class Represented by Amount in Row (9) 7.0%
--------------------------------------------------------------------------------
      12.   Type of Reporting Person (See Instructions) IA
--------------------------------------------------------------------------------


                               Page 2 of 6 pages



                         INSTRUCTIONS FOR SCHEDULE 13G

INSTRUCTIONS FOR COVER PAGE

(1)   Names and I.R.S. Identification Numbers of Reporting Persons--Furnish the
      full legal name of each person for whom the report is filed--i.e., each
      person required to sign the schedule itself--including each member of a
      group. Do not include the name of a person required to be identified in
      the report but who is not a reporting person. Reporting persons that are
      entities are also requested to furnish their I.R.S. identification
      numbers, although disclosure of such numbers is voluntary, not mandatory
      (see "SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G" below).

(2)   If any of the shares beneficially owned by a reporting person are held as
      a member of a group and that membership is expressly affirmed, please
      check row 2(a). If the reporting person disclaims membership in a group or
      describes a relationship with other persons but does not affirm the
      existence of a group, please check row 2(b) [unless it is a joint filing
      pursuant to Rule 13d-1(k)(1) in which case it may not be necessary to
      check row 2(b)].

(3)   The third row is for SEC internal use; please leave blank.

(4)   Citizenship or Place of Organization--Furnish citizenship if the named
      reporting person is a natural person. Otherwise, furnish place of
      organization.

(5)-(9), (11) Aggregate Amount Beneficially Owned By Each Reporting Person,
      Etc.--Rows (5) through (9) inclusive, and (11) are to be completed in
      accordance with the provisions of Item 4 of Schedule 13G. All percentages
      are to be rounded off to the nearest tenth (one place after decimal
      point).

(10)  Check if the aggregate amount reported as beneficially owned in row (9)
      does not include shares as to which beneficial ownership is disclaimed
      pursuant to Rule 13d-4 (17 CFR 240.13d-4) under the Securities Exchange
      Act of 1934.

(12)  Type of Reporting Person--Please classify each "reporting person"
      according to the following breakdown (see Item 3 of Schedule 13G) and
      place the appropriate symbol on the form:



         Category                          Symbol
                                        
Broker Dealer                                BD
Bank                                         BK
Insurance Company                            IC
Investment Company                           IV
Investment Adviser                           IA
Employee Benefit Plan, Pension Fund,
         or Endowment Fund                   EP
Parent Holding Company/Control Person        HC
Savings Association                          SA
Church Plan                                  CP
Corporation                                  CO
Partnership                                  PN
Individual                                   IN
Other                                        OO


Notes:
         Attach as many copies of the second part of the cover page as are
needed, one reporting person per page.

         Filing persons may, in order to avoid unnecessary duplication, answer
items on the schedules (Schedule 13D, 13G or 14D-1) by appropriate cross
references to an item or items on the cover page(s). This approach may only be
used where the cover page item or items provide all the disclosure required by
the schedule item. Moreover, such a use of a cover page item will result in the
item becoming a part of the schedule and accordingly being considered as "filed"
for purposes of Section 18 of the Securities Exchange Act or otherwise subject
to the liabilities of that section of the Act.

         Reporting persons may comply with their cover page filing requirements
by filing either completed copies of the blank forms available from the
Commission, printed or typed facsimiles, or computer printed facsimiles,
provided the documents filed have identical formats to the forms prescribed in
the Commission's regulations and meet existing Securities Exchange Act rules as
to such matters as clarity and size (Securities Exchange Act Rule 12b-12).

              SPECIAL INSTRUCTIONS FOR COMPLYING WITH SCHEDULE 13G

         Under Sections 13(d), 13(g), and 23 of the Securities Exchange Act of
1934 and the rules and regulations thereunder, the Commission is authorized to
solicit the information required to be supplied by this schedule by certain
security holders of certain issuers.

                               Page 3 of 6 pages


         Disclosure of the information specified in this schedule is mandatory,
except for I.R.S. identification numbers, disclosure of which is voluntary.
The information will be used for the primary purpose of determining and
disclosing the holdings of certain beneficial owners of certain equity
securities. This statement will be made a matter of public record. Therefore,
any information given will be available for inspection by any member of the
public.

         Because of the public nature of the information, the Commission can use
it for a variety of purposes, including referral to other governmental
authorities or securities self-regulatory organizations for investigatory
purposes or in connection with litigation involving the Federal securities laws
or other civil, criminal or regulatory statutes or provisions. I.R.S.
identification numbers, if furnished, will assist the Commission in identifying
security holders and, therefore, in promptly processing statements of beneficial
ownership of securities.

         Failure to disclose the information requested by this schedule, except
for I.R.S. identification numbers, may result in civil or criminal action
against the persons involved for violation of the Federal securities laws and
rules promulgated thereunder.

                              GENERAL INSTRUCTIONS

A.    Statements filed pursuant to Rule 13d-1(b) containing the information
      required by this schedule shall be filed not later than February 14
      following the calendar year covered by the statement or within the time
      specified in Rules 13d-1(b)(2) and 13d-2(c). Statements filed pursuant to
      Rule 13d-1(c) shall be filed within the time specified in Rules 13d-1(c),
      13d-2(b) and 13d-2(d). Statements filed pursuant to Rule 13d-1(d) shall be
      filed not later than February 14 following the calendar year covered by
      the statement pursuant to Rules 13d-1(d) and 13d-2(b).

B.    Information contained in a form which is required to be filed by rules
      under section 13(f) (15 U.S.C. 78m(f)) for the same calendar year as that
      covered by a statement on this schedule may be incorporated by reference
      in response to any of the items of this schedule. If such information is
      incorporated by reference in this schedule, copies of the relevant pages
      of such form shall be filed as an exhibit to this schedule.

C.    The item numbers and captions of the items shall be included but the text
      of the items is to be omitted. The answers to the items shall be so
      prepared as to indicate clearly the coverage of the items without
      referring to the text of the items. Answer every item. If an item is
      inapplicable or the answer is in the negative, so state.

ITEM 1.

 (a)   Name of Issuer   Charles River Laboratories International, Inc.

 (b)   Address of Issuer's Principal Executive Offices
       251 Ballardvale Street, Wilmington, MA 01887

ITEM 2.

 (a)   Name of Person Filing   H.A. Schupf & Co., LLC

 (b)   Address of Principal Business Office or, if none, Residence
       590 Madison Avenue, New York, NY 10022

 (c)   Citizenship   Delaware

 (d)   Title of Class of Securities   Common Stock; $.01 par value

 (e)   CUSIP Number   159864107

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SECTIONS 240.13d-1(b) OR
240.13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:

 (a) [ ]   Broker or dealer registered under section 15 of the Act (15 U.S.C.
           78o).

 (b) [ ]   Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

 (c) [ ]   Insurance company as defined in section 3(a)(19) of the Act (15
           U.S.C. 78c).

 (d) [ ]   Investment company registered under section 8 of the Investment
           Company Act of 1940 (15 U.S.C 80a-8).

 (e) [X]   An investment adviser in accordance with Section
           240.13d-1(b)(1)(ii)(E);

 (f) [ ]   An employee benefit plan or endowment fund in accordance with
           Section 240.13d-1(b)(1)(ii)(F);

 (g) [ ]   A parent holding company or control person in accordance with Section
           240.13d-1(b)(1)(ii)(G);

 (h) [ ]   A savings associations as defined in Section 3(b) of the Federal
           Deposit Insurance Act (12 U.S.C. 1813);

 (i) [ ]   A church plan that is excluded from the definition of an investment
           company under section 3(c)(14) of the Investment Company Act of 1940
           (15 U.S.C. 80a-3);

                                Page 4 of 6 pages


 (j) [ ]    Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).

ITEM 4. OWNERSHIP.

      Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

      (a)   Amount beneficially owned: 3,197,470.

      (b)   Percent of class: 7.0%.

      (c)   Number of shares as to which the person has:

            (i)   Sole power to vote or to direct the vote 3,197,470.

            (ii)  Shared power to vote or to direct the vote -0-.

            (iii) Sole power to dispose or to direct the disposition of
                  3,197,470.

            (iv)  Shared power to dispose or to direct the disposition of -0-.

Instruction. For computations regarding securities which represent a right to
acquire an underlying security see Section 240.13d-3(d)(1).

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

         If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following [ ].

Instruction: Dissolution of a group requires a response to this item.

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

         If any other person is known to have the right to receive or the power
to direct the receipt of dividends from, or the proceeds from the sale of, such
securities, a statement to that effect should be included in response to this
item and, if such interest relates to more than five percent of the class, such
person should be identified. A listing of the shareholders of an investment
company registered under the Investment Company Act of 1940 or the beneficiaries
of employee benefit plan, pension fund or endowment fund is not required.

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

         If a parent holding company has filed this schedule, pursuant to Rule
13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the
identity and the Item 3 classification of the relevant subsidiary. If a parent
holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule
13d-1(d), attach an exhibit stating the identification of the relevant
subsidiary.

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

     If a group has filed this schedule pursuant to Section
240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit
stating the identity and Item 3 classification of each member of the group. If a
group has filed this schedule pursuant to Section 240.13d-1(c) or Section
240.13d-1(d), attach an exhibit stating the identity of each member of the
group.

ITEM 9. NOTICE OF DISSOLUTION OF GROUP

         Notice of dissolution of a group may be furnished as an exhibit stating
the date of the dissolution and that all further filings with respect to
transactions in the security reported on will be filed, if required, by members
of the group, in their individual capacity. See Item 5.

ITEM 10. CERTIFICATION

                               Page 5 of 6 pages


(a)   The following certification shall be included if the statement is filed
      pursuant to Section 240.13d-1(b):

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were acquired and are held
            in the ordinary course of business and were not acquired and are not
            held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            any transaction having that purpose or effect.

(b)   The following certification shall be included if the statement is filed
      pursuant to Section 240.13d-1(c):

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were not acquired and are
            not held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            any transaction having that purpose or effect.

                                   SIGNATURE

      After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

                                February 9, 2004
                                ------------------------------------------------
                                                         Date

                                /s/ H. Axel Schupf
                                ------------------------------------------------
                                                         Signature

                                H. Axel Schupf, Managing Member
                                ------------------------------------------------
                                                         Name/Title

      The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Section 240.13d-7 for other
parties for whom copies are to be sent.

            ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
           CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)


                               Page 6 of 6 pages