If you spot a group of bears, and you usually don’t, except when Mama Bear is towing Baby Bear, you can safely say, “Look! A sleuth of bears!”
You can have more interspecies fun with other animal-group names: for example, a clowder of cats, a gang of elks and a mob of emus.
Foxes come in skulks, and gorillas in bands. Cobras group in quivers, and groups of crows are called murders. Ponies, apparently, string, and rattlesnakes rhumba.
It’s hard to catch a wisp of snipe, but a pitying of turtledoves happens more frequently.
Starlings grouped are called a murmuration, and swans, a lamentation.
You may not want an unkindness of ravens in your yard, but how about a tiding of magpies?