Sasquatch Heart is an animal item found in Undead Nightmare. If the player kills a Sasquatch, they can then search the body for a Sasquatch Heart. Notice that the description of the item ("The heart of a forgotten soul") explains that the creature is simply misunderstood by mankind.
|Hey there, cowboy. It looks like this little ol' article is a bit puny.|
I reckon you could impress me by adding to it. Don't be shy now.
If you're logged in, it'll help you earn them fancy achievements, too.
Sometimes, the player will not be given the loot prompt after killing a sasquatch, thus not being able to loot Sasquatch heart. It is said that reloading a save may fix this.