(oil and gas corporations charged with criminal misdemeanors for violating Migratory Bird Treaty Act (Act) by “taking” or “killing” birds when dead birds were found around their reserve pits; court held statutory use of “take” and “kill” does not refer to accidental activity or the unintended results of other conduct; court dismissed government’s claims which would criminalize lawful, commercial activity that may indirectly injure or kill migratory birds; such claim is not permitted under the Act).