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| What an animal does and how it does it. |
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| states that explanations should be no more complicated then necessary |
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| states that we should interpret animal behavios in terms of the simplest neural mechanism that can explain the observed behavior. should not be applied too rigidly to complex behavior patterns in higher animals |
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| The basis for analyzing behavior as a compromise of feeding costs versus feeding benefits. |
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| A heuristic approach based on the expectation that Darwinian fitness (reproductive success) is improved by optimal behavior. |
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| The evolutionary explanation for a behavioral, physiological, or morphological response, in contrast to proximate causation; the immediate mechanisms that underlie a response. |
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| The immediate mechanisms underlying an organism's behavioral, physiological, or morphological response, in contrast to ultimate, or evolutionary causation. |
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| The study of animal behavior in natural conditions. |
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| A sequence of behavioral acts that is essentially unchangeable and usually carried to completion once initiated. |
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| An external sensory stimulus that triggers a fixed action pattern. |
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| A signal stimulus that functions as a communication signal between individuals of the same species. |
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