Researchers said in a new study that they were stunned to witness California ground squirrels, who mostly eat nuts and seeds, hunting and eating voles.

WASHINGTON – Squirrels might look like adorable, nut-hoarding furballs but some are ruthless predators that hunt, tear apart and devour voles. That is the startling finding of a new study ...

But what they saw shocked them: Despite an abundance of their main food sources, the squirrels also hunted and ate small rodents called voles ... in an email to The Washington Post.