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THE WARRANTS REPRESENTED BY THIS CERTIFICATE MAY NOT BE EXERCISED UNLESS A
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
COVERING THE ISSUANCE OF SHARES OF COMMON STOCK UPON THE EXERCISE OF THIS
WARRANT IS IN EFFECT AND CURRENT AT THE TIME OF EXERCISE OR UNLESS THE
ISSUANCE OF SHARES OF COMMON STOCK UPON ANY EXERCISE IS EXEMPT FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT OF 1933 AND UNDER
APPLICABLE STATE SECURITIES LAWS.

                           KESTREL ENERGY, INC.

                     WARRANT TO PURCHASE COMMON STOCK
No. W-----
                                                          CUSIP ------

     This Warrant Certificate certifies that             , the registered
holder hereof, or registered assigns ("the Registered Holder") is entitled
to purchase from Kestrel Energy, Inc., a Colorado corporation (the
"Company"), subject to the terms and conditions hereof and of the Warrant
Agreement referred to below, at any time on or after the effective date of
the Company's registration statement as filed with the Securities and
Exchange Commission which includes the shares underlying the Warrants, and
until the close of business on February 4, 2001, at the purchase price of
$3.125 (the "Exercise Price"), the number of shares of common stock, no
par value, of the Company (the "Common Stock") which is initially equal to
the number of Warrants set forth above.   The number of shares purchasable
upon exercise of these Warrants and the Exercise Price per Warrant shall
be subject to adjustment from time to time as set forth in the Warrant
Agreement referred to below, and these Warrants are subject to redemption
by the Company at $0.01 per Warrant, at any time prior to their
expiration, on not less than 30 days' prior written notice to the holders
of Warrants, provided that the daily trading price per share of Common
Stock has been at least $3.75 (120% of the Warrant exercise price) for a
period of at least five consecutive trading days ending the trading day
prior to the date upon which the notice of redemption is given, as more
specifically described in the Warrant Agreement.  During the 30-day period
immediately following the giving of such notice, the Registered Holders
shall have the right to exercise the Warrants so held by them.  Upon
expiration of such 30-day period, all rights of the Registered Holders
shall terminate, other than the rights to receive the redemption price,
without interest.

     These Warrants may be exercised in whole or in part by presentation
of this Warrant Certificate with the Purchase Form on the reverse side
[attached] hereof duly executed and simultaneous payment of the Exercise
Price (subject to adjustment) made payable to Kestrel Energy, Inc. at the
principal office of American Securities Transfer & Trust, Inc. (the
"Warrant Agent").  Payment of such price shall be made at the option of
the Registered Holder hereof in cash, by certified or official bank check
or any combination thereof.

     These Warrants are part of a duly authorized dividend distribution of
one Warrant for every ten shares of outstanding Common Stock held of
record by the Company's shareholders at the close of business on February
4, 2000, and issued under and in accordance with a Warrant Agreement dated
as of January 18, 2000, between the Company and the Warrant Agent and are
subject to the terms and provisions contained in the Warrant Agreement, to
all of which the Registered Holder of these Warrants by acceptance hereof
consents.  The Registered Holder hereof upon written request to the
Warrant Agent may obtain a copy of the Warrant Agreement for inspection.

     Upon any partial exercise of these Warrants, there shall be
countersigned and issued to the Registered Holder hereof a new Warrant
Certificate in respect of the shares of Common Stock as to which these
Warrants shall not have been exercised.  These Warrants may be exchanged
at the office of the Warrant Agent by surrender of these Warrants properly
endorsed either separately or in combination with one or more other
Warrants for one or more new Warrant Certificates entitling the Registered
Holder thereof to purchase the same aggregate number of shares as were
purchasable on exercise of these Warrants. The Company shall not be
required to issue fractions of Warrants upon any such adjustment or to
issue fractions of shares upon the exercise of any Warrants upon any such
adjustment, in accordance with the Warrant Agreement.  These Warrants are
transferable at the office of the Warrant Agent in Lakewood, Colorado in
the manner and subject to the limitations set forth in the Warrant
Agreement.  The Warrants may not be sold, transferred, assigned, pledged
or hypothecated, in whole or in part, prior to the effective date of the
Company's registrations statement covering the resale of the Warrants,
unless an exemption from the registration requirements of the Securities
Act of 1933 and any applicable state securities laws is available, the
availability of which must be established to the reasonable satisfaction
of the Company and its counsel, and except by will or operation of law.
The Registered Holder hereof, until the transfer has been recorded on the
books of the Company, may be treated by the Company, the Warrant Agent,
and all other persons dealing with these Warrants as the absolute owner
hereof for any purpose and as the person entitled to exercise the right
represented hereby, or to the transfer hereof on the books of the Company,
any notice to the contrary notwithstanding.

     These Warrants do not entitle any Registered Holder hereof to any of
the rights of a shareholder of the Company.

     This Warrant Certificate shall not be valid or obligatory for any
purpose until it shall have been countersigned by the Warrant Agent.

Dated: --------------------        KESTREL ENERGY, INC.

----------------------------       By:-----------------------------
Mark A. Boatright, Secretary         Timothy L. Hoops, President

                                     AMERICAN SECURITIES TRANSFER &
                                     TRUST, INC.
                                     Warrant Agent

                                     By:--------------------------
                                        ----------------, President

                           KESTREL ENERGY, INC.

                    TRANSFER FEE $20.00 PER CERTIFICATE

     This Warrant Certificate, when surrendered to the Warrant Agent at
its principal office by the Warrant Holder, in person or by attorney duly
authorized in writing in the manner and subject to the limitations
provided in the Warrant Agreement, may be exchanged upon payment of $20.00
per certificate or certificates of like tenor and evidencing in the
aggregate number of Warrants, subject to any adjustments made in
accordance with the provisions of the Warrant Agreement.

     The Company and the Warrant Agreement may deem and treat the
registered holder hereof as the absolute owner of this Warrant certificate
(notwithstanding any notation of ownership or other writing hereon made by
anyone) for all purposes and neither the Company nor the Warrant Agent
shall be affected by any notice to the contrary.  No Warrant Holder, as
such, shall have any rights of a shareholder of the Company, either at law
or at equity, and the rights of the Warrant Holders, as such, are limited
to those rights expressly provided in the Warrant Agreement and in the
Warrant Certificate.

     The Exercise Price is subject to adjustment if the Company shall
prior to the exercise of any Warrants, effect one or more stock splits,
stock dividends, or other increases or reductions of the number of shares
of its no par value common stock outstanding without receiving
compensation therefor in money, services or property.

     The Company shall not be required to issue fractions of Warrants upon
any such adjustment or to issue fractions of shares upon issuance of any
Warrants after any such adjustment, but the Company, in lieu of issuing
any such fractional interest, shall round up or down to the nearest whole
Warrant.

                                ASSIGNMENT

        (For of Assignment to be Executed if the Registered Holder
              Desires to Transfer Warrants Evidenced Hereby)

     FOR VALUE RECEIVED ------------------- hereby sells, assigns and
transfers to ---------------------------- (please print name and address
including zip codes) Warrants represented by this Warrant Certificate, and
does hereby irrevocably constitute and appoint ----------------- Attorney
to transfer the said Warrants on the books of the Warrant Agent with full
power of substitution.

Dated:---------------                   ------------------------------
                                                  Signature

NOTICE:   The above signature must correspond with the name as written
          upon the face of the within Warrant Certificate in every
          particular, without alteration or enlargement or any change
          whatsoever.

Medallion Signature Guaranteed:------------------------------

                                 EXERCISE

         (Form of Exercise to be Executed if the Registered Holder
              Desires to Exercise Warrants Evidenced Hereby)

To Kestrel Energy, Inc.:

     The undersigned hereby irrevocably elects to exercise ----------
Warrants, evidenced by the within Warrant Certificate for, and to purchase
thereunder, ---------- full shares of Common Stock issuable upon exercise
of said Warrants and delivery of $--------- and any applicable taxes.

     The undersigned requests that certificates for such shares be issued
in the name of:
                                        PLEASE INSERT SOCIAL SECURITY OR
                                        TAX IDENTIFICATION NUMBER

-------------------------------         --------------------------------
(Please print name and address)

-------------------------------         --------------------------------

-------------------------------         --------------------------------

     If said number of Warrants shall not be all the Warrants evidenced by
the within Warrant Certificate, the undersigned requests that a new
Warrant Certificate evidencing the Warrants not so exercised be issued in
the name of and delivered to:

------------------------------------------------------------------------
                      (Please print name and address)
------------------------------------------------------------------------

------------------------------------------------------------------------

Dated:-------------------------         Signature: ---------------------

NOTICE:   The above signature must correspond with the name as written
          upon the face of the within Warrant Certificate in every
          particular, without alteration or enlargement or any change
          whatsoever, or if signed by any other person the Form of
          Assignment hereon must be duly executed and if the certificate
          representing the shares or any Warrant Certificate representing
          Warrants not exercised is to be registered in a name other than
          that in which the within Warrant Certificate is registered, the
          signature of the holder hereof must be guaranteed.

Medallion Signature Guaranteed:  ---------------------------

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT
TO S.E.C. RULE 17Ad-15.<PAGE>

                                                                     EXHIBIT 4.1

===============================================================================

                         [LOGO OF DIVERSA CORPORATION]

    COMMON STOCK                                              COMMON STOCK
      CM_______
        NUMBER                                                   SHARES

INCORPORATED UNDER THE                                  SEE REVERSE FOR CERTAIN
  LAWS OF THE STATE                                           DEFINITIONS
       DELAWARE                                         CUSIP

    THIS CERTIFIES THAT

    IS THE RECORD HOLDER OF

           FULLY PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK,
                              $0.001 PAR VALUE OF

                              DIVERSA CORPORATION

transferable on the books of the Corporation in person or by duly authorized
attorney on surrender of this certificate properly endorsed. This certificate
shall not be valid until countersigned and registered by the Transfer Agent and
Registrar.

WITNESS the facsimile seal of the Corporation and the signatures of its duly
authorized officers.

Dated:___________________

                    [CORPORATE SEAL OF DIVERSA CORPORATION]

/s/______________________                             /s/______________________
        SECRETARY                                               PRESIDENT

                               COUNTERSIGNED AND REGISTERED:
                                        AMERICAN STOCK TRANSFER & TRUST COMPANY
                                                 TRANSFER AGENT AND REGISTRAR
                               BY_______________________________________________
                                                            AUTHORIZED SIGNATURE

================================================================================

<PAGE>

================================================================================

The Corporation will furnish without charge to each stockholder who so requests
the powers, designations, preferences and relative, participating, optional, or
other special rights of each class of stock or series thereof and the
qualifications, limitations or restrictions of such preferences and/or rights.
Such requests shall be made to the Corporation's Secretary at the principal
office of the Corporation.

KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED THE
CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO THE ISSUANCE OF A
REPLACEMENT CERTIFICATE.

The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

 TEN COM - as tenants in common   UNIF GIFT MIN ACT-.........Custodian.........
 TEN ENT - as tenants by the                         (Cust)           (Minor)
           entireties                               under Uniform Gifts to
 JP TEN  - as joint tenants with                    Minors Act..................
           right of survivorship                                   (State)
           and not as tenants in  UNIF TRF MIN ACT- .....Custodian (until age..)
           common                                   (Cust)
                                                    ......under Uniform Transfer
                                                    (Minor)
                                                    to Minors Act...............
                                                                    (State)

    Additional abbreviations may also be used though not in the above list.

    FOR VALUE RECEIVED, _____________________________ hereby sell, assign and
transfer unto

PLEASE INSERT SOCIAL SECURITY
 OR OTHER IDENTIFYING NUMBER
        OF ASSIGNEE

_____________________________

_____________________________

________________________________________________________________________________
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

________________________________________________________________________________

________________________________________________________________________________

_________________________________________________________________________ Shares
of the common stock represented by the within Certificate,
and do hereby irrevocably constitute and appoint

________________________________________________________________________Attorney
to transfer the said stock on the books of the within named
Corporation with full power of substitution in the premises.

Dated ____________________________

                                         X  __________________________________

                                         X  __________________________________
                                    NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT
                                            MUST CORRESPOND WITH THE NAME(S) AS
                                            WRITTEN UPON THE FACE OF THE
                                            CERTIFICATE IN EVERY PARTICULAR,
                                            WITHOUT ALTERATION OR ENLARGEMENT OR
                                            ANY CHANGE WHATEVER.
Signature(s) Guaranteed

By_________________________________
THE SIGNATURE(S) MUST BE GUARANTEED
BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND
LOAN ASSOCIATIONS AND CREDIT UNIONS
WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM),
PURSUANT TO S.E.C. RULE 17Ad-15.

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