Contrary to popular myth, a wolf howl does have an echo. There is a bit of howling etiquette too, with the Alpha male and female correcting pack members or puppies that have howled at the wrong times.

What does it mean when wolves are howling?

Wolves howl to communicate their location to other pack members and to ward off rivaling packs from their territory. ... Another sort of howl is an aggressive howl to other packs. It warns other packs or individual wolves in the area to stay away from the territory. A pack will also mark territory by using urine and feces.

Which animal howl does not produce an echo?

Actually, according to animal planet "the wolf's howl is at a precise frequency that doesn't echo across canyons, so that other wolves can be sure of the direction of the howl, and locate the wolf." Maybe what they mean is that this certain frequency, over long ranges, somehow cancels out its own echo.