Cats purr in many situations, from contentment and greeting to stress and pain. Scientists still do not fully agree on why, or exactly how, the sound is made.
Starter thread · AI-reviewed against its sources
A forager's figure-eight dance encodes distance in the length of its waggle run and direction in the run's angle from vertical, which stands for the angle from the sun.
Starter thread · AI-reviewed against its sources
The handicap principle holds that signals are honest because they are costly. It became widely accepted, but a 2019 review argues the idea is erroneous and that honesty can evolve without costs.
Starter thread · AI-reviewed against its sources
