What sound do you think ravens make? Let’s hear it!

CALLS

Common Ravens make many different kinds of calls varying from a low, gurgling croak to harsh grating sounds and shrill alarm calls. Scientists have placed their vocalizations into as many as 33 different categories based on sound and context. The most commonly heard is the classic gurgling croak, rising in pitch and seeming to come from the back of the throat. It’s much deeper and more musical than a crow’s simple, scratchy caw. Ravens make this call often. It’s audible for more than a mile, and ravens often give it in response to other ravens they hear in the distance. Among their other calls, ravens make short, repeated, shrill calls when chasing predators or trespassers, and deep, rasping calls when their nests are disturbed. Dominant females sometimes make a rapid series of 12 or so loud knocking sounds that lasts about a second. Common Ravens can mimic other birds, and when raised in captivity can even be taught words.

OTHER SOUNDS

Displaying males and females snap their beaks audibly. Females performing the rapid knocking call often end it with a bill snap.

Intelligence

Scientists and casual observers alike have known for years that ravens and their corvid relatives are extremely smart. But most studies use single experiments that provide a limited view of their overall intelligence. “Quite often, in single tasks, you’re just testing whether the bird can understand that you’re hiding something,” says Simone Pika, a cognitive scientist at Osnabrück University in Germany.

A new study that that tries to address that deficit provides some of the best proof yet that ravens, including young birds of just four months of age, have certain types of smarts that are on par with those of adult great apes. The brainy birds performed just as well as chimpanzees and orangutans across a broad array of tasks designed to measure intelligence. “We now have very strong evidence to say that, at least in the tasks we used, ravens are very similar to great apes,” says Pika, lead author of the study. “Across a whole spectrum of cognitive skills, their intelligence is really quite amazing.” The findings, published in Scientific Reports, add to a growing body of evidence indicating that impressive cognitive skills are not solely the domain of primates but occur in certain species across the animal kingdom.