List three examples of stimuli that a bird responds to

Stimuli refer to a thing or event that arouses the energy or give reaction to something or to someone.
Now, let’s give 3 examples of stimuli that a bird responds to:
=>  Weather Condition – When something bad weather is coming, birds are flying to a different direction that’s away from the bad weather of typhoon.
=> temperature – Birds are not going to stay on a place with too cold and too hot temperature.
=> food availability – birds will always look for a place with abundant food. If there’s no longer food available  to the place they’re in, they’re going to transfer to another place.

A) early horses is your answer