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Biology
Grade 9-12
Animal Behavior & Ethology Reference Cheat Sheet
A printable reference covering innate behavior, learned behavior, imprinting, conditioning, communication, foraging, mating systems, and social behavior for grades 9-12.
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Animal behavior and ethology study how and why animals act the way they do in response to genes, environment, learning, and evolution. This cheat sheet helps students compare behavior types, recognize common examples, and connect behavior to survival and reproduction. It is useful for biology units on ecology, evolution, nervous systems, and adaptation.
Key Facts
- Innate behaviors are inherited and performed correctly without prior learning, such as reflexes, fixed action patterns, and many instincts.
- Learned behaviors develop through experience, so an animal can change its response based on practice, association, observation, or consequences.
- Classical conditioning occurs when a neutral stimulus becomes associated with a meaningful stimulus, such as bell plus food leading to salivation.
- Operant conditioning occurs when behavior changes because of consequences, where reinforcement increases a behavior and punishment decreases a behavior.
- Imprinting is learning during a sensitive period, such as young geese following the first moving object they see after hatching.
- Fitness benefit can be measured as reproductive success, so behaviors are favored by natural selection when they increase survival or the number of viable offspring.
- Optimal foraging predicts that animals tend to maximize net energy gain, where net gain = energy gained from food - energy spent obtaining it.
- Altruistic behavior can evolve through kin selection when helping relatives increases inclusive fitness, summarized by Hamilton's rule: rB > C.
Vocabulary
- Ethology
- Ethology is the scientific study of animal behavior, especially behavior in natural environments.
- Fixed action pattern
- A fixed action pattern is an innate sequence of behavior triggered by a specific stimulus and usually carried out to completion.
- Habituation
- Habituation is a decrease in response to a repeated harmless stimulus.
- Imprinting
- Imprinting is rapid learning that happens during a limited sensitive period and is often difficult to reverse.
- Pheromone
- A pheromone is a chemical signal released by one animal that affects the behavior or physiology of another animal of the same species.
- Inclusive fitness
- Inclusive fitness is an animal's total genetic contribution through its own offspring and by helping relatives reproduce.
Common Mistakes to Avoid
- Calling every instinct a reflex is wrong because reflexes are simple automatic responses, while instincts can involve complex behavior patterns.
- Assuming learned behaviors are not influenced by genes is wrong because genes can shape an animal's ability, limits, and tendency to learn certain behaviors.
- Confusing classical and operant conditioning is wrong because classical conditioning links two stimuli, while operant conditioning links a behavior with a consequence.
- Saying altruism always hurts evolution is wrong because helping relatives can increase shared gene success when the benefit to relatives is greater than the cost.
- Ignoring the environment when explaining behavior is wrong because many behaviors result from both inherited tendencies and environmental conditions.
Practice Questions
- 1 A rat presses a lever and receives a food pellet, then presses the lever more often. What type of learning is shown, and what is the reinforcement?
- 2 A bird gains 45 kJ from eating insects but spends 12 kJ searching and catching them. What is the net energy gain?
- 3 Using Hamilton's rule rB > C, would altruism be favored if r = 0.5, B = 10, and C = 4? Show the comparison.
- 4 A young animal raised without adults still performs a species-specific courtship display as an adult. Explain why this behavior is likely innate rather than learned.