When people think of a smart animal, a fish rarely comes to mind. But fish can be smart too, in ways that might surprise you.

Measuring animal intelligence is tricky. As humans, we can only compare the smarts of other creatures with our own — an inherently biased benchmark. "Asking which species is smarter is like asking if ...

The New Caledonian crow is a bird capable of creating rudimentary tools and even improving them, sharing its discoveries and ...

Dogs are smarter than cats, according to new research, but how do other species' IQs match up against each other? The Daily Beast pits dolphins vs. chimps, pigs vs. dogs, and more. Gallery: Animal IQ ...