The great horned owl is the most common owl of the Americas, easily recognizable because of the feather tufts on its head. These “plumicorns” resemble horns or, to some, catlike ears.

A great horned owl at the Habitat Education Center in Belmont died after ingesting rat poison, Mass Audubon announced Wednesday. A visitor called Mass Audubon on Nov. 5 when they saw the owl ...