Animal behavior is the study of how animals act in response to internal needs and external signals. Ethology focuses on behavior in natural settings, while related lab studies test how learning and physiology shape responses. Understanding behavior matters because actions such as hunting, migration, courtship, and parenting affect survival and reproduction.
A behavior can be described, measured, and connected to its cause, development, function, and evolutionary history.
Some behaviors are innate, meaning they appear without prior experience, while others are learned through interaction with the environment. Imprinting in young birds, conditioning in lab rats, and instinctive hunting in foxes show different ways behavior can be organized. Natural selection favors behaviors that increase fitness, such as finding food efficiently or avoiding predators.
Scientists compare species, run controlled experiments, and observe animals in the field to explain both the mechanism and adaptive value of behavior.
Key Facts
- Behavior = any observable action an animal performs in response to a stimulus.
- Innate behavior is genetically influenced and does not require learning, such as a fixed action pattern.
- Learned behavior changes with experience, including habituation, imprinting, and conditioning.
- Classical conditioning pairs two stimuli so that one stimulus begins to trigger a learned response.
- Operant conditioning links a behavior to a consequence, so reward increases behavior and punishment decreases it.
- Fitness benefit can be estimated as net benefit = reproductive benefit - survival cost.
Vocabulary
- Ethology
- Ethology is the scientific study of animal behavior, especially behavior observed in natural environments.
- Innate behavior
- Innate behavior is an inherited response that an animal can perform correctly without prior experience.
- Imprinting
- Imprinting is a rapid form of learning during a sensitive period, often seen when young birds follow the first moving object they recognize as a parent.
- Conditioning
- Conditioning is learning that occurs when an animal forms an association between a stimulus, a behavior, and an outcome.
- Adaptive value
- Adaptive value is the contribution a behavior makes to an animal's survival and reproductive success.
Common Mistakes to Avoid
- Calling every behavior instinct, because many behaviors are shaped by learning, environment, and past experience.
- Confusing classical conditioning with operant conditioning, because classical conditioning links stimuli while operant conditioning links actions to consequences.
- Assuming learned behavior is not biological, because learning still depends on the nervous system, genes, hormones, and sensory abilities.
- Claiming a behavior is adaptive just because it exists, because scientists must show that the behavior increases survival or reproduction compared with alternatives.
Practice Questions
- 1 In a conditioning experiment, a rat presses a lever 12 times in the first 5 minutes and 30 times in the next 5 minutes after receiving food rewards. By what percent did the lever pressing rate increase?
- 2 A duckling follows the first moving object it sees during a 6 hour sensitive period after hatching. If it first sees a moving model at 2.5 hours after hatching, how many hours remain in the sensitive period?
- 3 A fox hunts more successfully after practicing pouncing, while ducklings follow a parent soon after hatching. Explain which behavior is more likely learned, which is more likely innate or imprinting, and how each could improve survival.