Some domestic cats still have a wild instinct in them that can be quite surprising when it becomes unleashed. Now imagine that wild instinct in a Maine cat -- It's hardy, it's salt-of-the-earth and it's got a LOT of courage.

A Maine cat owner caught this incredible video, as he was looking out at the back yard of his courageous pet stalking a herd of deer. At first, it seems like the cat is just testing the deer to see how close he can get to them. Then, all hell breaks loose once "Fluffy" makes his move.

Check out this impressive video:

Some cats are more intrigued about the situation:

Even squirrels get in on the action: