Nearly 50 years after its development, only a handful of creatures have passed the self-awareness exam. A new attempt with fish highlights a debate over the test’s use and meaning.
The exaggerated horns and elongated forelegs of male flower beetles, which use these appendages as weapons in combat for females, do not slow down the insects in a race.
Scientists are enlisting the help of pigeons, parrots, crows, jays, and other species to disprove the notion that human cognitive abilities are beyond those of other animals.