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Wolves, but no dogs, in Scandinavian wolf population’s heritage

There is no evidence that Scandinavia’s wolf population has been influenced by dog-wolf hybrids, new research shows.

What makes an animal clever? Research shows that intelligence is not just about using tools

The list of animals that use tools keeps growing, from chimps to birds and even octopuses. So is it time that we abandoned "tool use" as a measure of intelligence among species?

Ravens can be as clever as chimps

A Swedish study shows that corvids – birds of or resembling the crow family – can be just as smart at certain tasks as chimpanzees, even though their brains are very much smaller.