How mixed-species foraging flocks develop in response to benefits from observational learning

Area of Science:

• Ethology
• Animal Behavior
• Social Learning

Background:

• Birds exhibit a baseline preference for interacting with conspecifics (individuals of the same species).
• Learned associations can override innate preferences in social interactions.
• Environmental factors, such as temperature, may influence social preferences.

Purpose of the Study:

• To investigate how social learning influences interspecific social preferences in birds.
• To determine if observing conspecific and non-conspecific demonstrators affects observer choice.
• To examine the role of foraging success and direct reinforcement in shaping social behavior.

Main Methods:

• Observers (great tit, Parus major; marsh tit, P. palustris) were exposed to five experimental conditions with conspecific and non-conspecific demonstrators.
• Conditions varied based on demonstrator feeding status and observer reinforcement (food).
• Observer approach behavior towards caged conspecifics and non-conspecifics was recorded post-treatment.

Main Results:

• A baseline preference for conspecifics was observed but could be overcome by learned associations.
• Observers approached successful non-conspecific foragers, especially when they were subordinate.
• Subordinate species observers approached dominant non-conspecifics only after receiving direct food reinforcement near them.
• Non-conspecific following increased at temperatures below 0°C, while conspecific following increased above 0°C.

Conclusions:

• Social learning, particularly through observing foraging success and direct rewards, significantly impacts interspecific social preferences.
• Learned associations can override innate conspecific preferences, leading to interactions with non-conspecifics.
• Environmental temperature modulates the extent to which birds interact with conspecifics versus non-conspecifics.