What animal grunts?

Answer:
A lot of animals grunt in some form. Mule Deer grunt when they are just meandering around, the Elk grunt to communicate, Black and Brown Bears grunt when they feel threatened, and Boar Hogs and Pigs grunt all the time. Mountain Lions and Cougars do not grunt but moan when they are discovered or threatened.

Lowland and Mountain Gorillas grunt, as do Baboons, Monkeys, and Humans.

On the lighter side: An OLD, old one-liner joke is: When I first got married, I used to wake up grumpy - but now I just let him/her sleep!
First answer by Derekkklo. Last edit by LeastDuck. Contributor trust: 692 [recommend contributor recommended]. Question popularity: 1 [recommend question].