From The Collaborative International Dictionary of English v.0.44 [gcide]:
3. (Biol.) To resemble (another species of animal, or a plant, or inanimate object) in form, color, ornamentation, or instinctive habits, so as to derive an advantage thereby; sa, when a harmless snake imitates a venomous one in color and manner, or when an odorless insect imitates, in color, one having secretion offensive to birds.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
98 Moby Thesaurus words for "imitate": act like, adopt, affect, ape, appear like, approach, appropriate, approximate, assume, be like, be redolent of, bear resemblance, borrow, bring to mind, burlesque, call to mind, call up, caricature, chorus, come again, come close, come near, compare with, copy, correspond, counterfeit, crib, derive from, ditto, do, do a repeat, do again, do like, do over, double, duplicate, echo, emulate, evoke, fake, favor, follow, forge, go like, hoke, hoke up, impersonate, infringe, look like, make like, make use of, match, mimic, mirror, mock, monkey, near, nearly reproduce, not tell apart, parallel, parody, parrot, partake of, pirate, plagiarize, quote, redo, redouble, reduplicate, reecho, reflect, regurgitate, reincarnate, remind one of, renew, repeat, replicate, reproduce, resemble, revive, satirize, savor of, say again, seem like, send up, simulate, smack of, sound like, spoof, stack up with, steal, suggest, take, take after, take off, take on, take over, travesty
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