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Allomones  -  Chemicals used for signaling between different species. Compare pheromones
Batesian mimicry  -  In this type of mimicry a harmless signaler imitates a dangerous one. Compare with Mullerian mimicry.
Contact reception  -  Reception that requires the receiver to be in contact with the signal chemical. Compare with olfactory reception.
Exocrine  -  Exocrine glands have ducts to release substances outside of the body rather than internally.
Hormones  -  Chemicals produced by endocrine glands for release into the body which function in feedback and control of behavior.
Intention movements  -  Incomplete behavior patterns that provide information about the activity a particular animal is about to perform and act as a signal to others.
Mullerian mimicry  -  In this type of mimicry two dangerous species evolve the same signaling trait to the mutual benefit of both. Compare with Batesian mimicry.
Olfactory reception  -  Reception of odors (smell). Waterborne or airborne chemicals can be detected at a distance from the source by olfactory reception. Compare with Contact reception.
Pheromones  -  Chemicals used for signaling between members of the same species. Compare allomones.
Plastic song  -  An intermediate stage of birdsong in which there are components of adult song patterns but the overall song is still highly variable.
Representational information  -  Information about the environment external to the signaler.
Ritualized  -  A behavior that once served its own purpose but has come to act as a signal about that purpose is said to have become ritualized.
Sterotypy  -  Frequent repetition of a signal behavior.
Subsong  -  An early stage of birdsong in which the song has little or no structure.
Zahavi's handicap principle  -  This principle states that in order to be honest, a signal must be costly to the signaler.