Animal behavior

Overview of Animal Behavior

  • All living organisms respond to stimuli.

Innate Behaviors

  • Definition: Innate behaviors are described as hardwired and genetic traits that organisms are born with, leading to uniform responses in a species to certain stimuli.

    • Stimulus: Sometimes called a releaser or sign stimulus, it is the trigger for the innate response.

    • Response: The reaction to the stimulus that must go to completion without stopping halfway.

Fixed Action Patterns (FAPs)

  • Definition: A sequence of behaviors that, once initiated, must proceed to completion without interruption.

  • Characteristics: Every individual in a particular species exhibits the same fixed action pattern.

    • Example 1: Gulls

    • Adult gulls have a red spot on their beak that stimulates pecking by chicks.

    • Chicks peck at the red spot to prompt the adult to regurgitate food, demonstrating a drive for nourishment.

    • Example 2: Stickleback Fish

    • Male sticklebacks display an aggressive behavior towards any male displaying a red spot, as it signifies territorial conflict.

    • Example 3: Geese and Egg Retrieval

    • A goose will instinctively roll eggs back into the nest regardless if it is a real egg or a rock mimicking one, reflecting instinctive behavior for preservation of offspring.

Biological Clocks or Rhythms

  • Types:

    • Circadian Rhythms: Daily cycles (24 hours), e.g., sleep-wake cycles.

    • Circannual Rhythms: Yearly cycles (approximately 365 days), e.g., bird migrations in autumn due to food availability.

  • Effect of Climate Change: Alterations in traditional migrations due to weather changes and food accessibility, leading to shifts in animal behavior.

    • Example: Canadian geese have changed migratory patterns due to less harsh winters and available food sources in their current habitats during winter.

Communication in Animals

  • Definition: Communication encompasses both vocal and non-vocal signals transmitting information among animals.

  • Types of Communication:

    • Chemical: Use of pheromones for mate attraction or signaling danger, as seen in moths or sick fish.

    • Visual: Physical displays, like honeybees' dance to communicate flower location or male fiddler crabs waving claws to signal for mates.

  • Examples:

    • Honeybees: Perform dances to share information on resource locations like food or identify threats to the colony.

    • Fiddler Crabs: Use the waving of one enlarged claw as part of their mating display.

Movement: Kinesis and Taxis

  • Types of Movement:

    • Kinesis: Non-directional movement in response to stimuli, such as pill bugs scattering randomly when a boundary (rock) is removed.

    • Example: Random movements of pill bugs when exposed to light or disturbance.

    • Taxis: Directed movement towards (positive taxis) or away (negative taxis) from a stimulus.

    • Examples:

      • Positive Phototaxis: Moths flying towards light.

      • Negative Geotaxis: Fruit flies moving upward against gravity.

      • Chemotaxis: Insects drawn to rotting fruit rather than fresh.

Learning Behaviors

  • Definition: Learned behaviors can change throughout an organism's life based on experiences.

Key Learning Types

  • Imprinting: Timed exposure to specific stimuli during crucial development phases leads to learned behaviors.

    • Example: Young geese imprint on their mother or immediate surroundings after hatching.

  • Spatial Learning: Animals form a cognitive map of their environment to navigate and remember locations.

    • Example: Elephants remembering distant watering holes or Clark's nutcracker storing seeds.

  • Associative Learning: Establishing an associative link between two stimuli.

    • Examples:

      • Habituation: Learning to ignore repeated stimuli, e.g., horses adapting to city noise.

      • Operant Conditioning: Learning through trial and error; finding food through environmental interaction, common in experimental designs with rats.

      • Classical Conditioning: Pavlov's dogs associating a bell with food and salivation, even when food is not present.

  • Cognition: Awareness and reasoning abilities that enable solving problems and decision-making.

    • Example: Crows displaying problem-solving abilities indicative of higher cognitive functions, comparable to a 6-year-old child.

  • Social Learning: Learning by observing and mimicking others in their environment or social group.

    • Example: Chimpanzees learning tool use or sea otters cracking shells with rocks based on observing others.

Conclusion

  • Animal behavior encompasses a variety of innate and learned responses to stimuli, with genetic predispositions influencing both types of behavior. Understanding these behaviors aids in comprehension of survival, communication, and adaptation across species.