Resemblance between organisms that influences a receiver’s animal behaviour and thereby changes fitness. Similarity alone does not establish the receiver-mediated evolutionary process.
A set of co-occurring organisms sharing a mimetic signal. Membership should be tested against the relevant receiver’s perception and behaviour rather than human resemblance alone.
Resemblance of a relatively undefended organism to a defended model that reduces attack through the receiver’s response to the model. Protection depends on model abundance and predator experience.
Shared warning signals among defended organisms, potentially reducing each participant’s cost of educating predators through predator learning. Benefits depend on encounter rates, defence and generalization.

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