Moles can hold right click or W(on mobile you hold W) and move underground to surprise other animals and eat them. When underground four brown dots will appear, similar to the four blue dots when diving in lakes or oceans.
They are a dark shade of grey, with a bright pink nose and slightly darker pink paws; on that note, they are also the first animal in the game to have paws.
It is recommended to bite a larger animal when burrowing to skip mole. BEWARE: After upgrading you can no longer go into small holes and you will have to run from what ever animal you bit. OR, to solve this problem, evolve into a ocean animal and you'll be fine. (Unless you spawn next to a predator, then good luck :D)
If you don't bite anyone and if you are being chased by a predator, go into a hiding hole next to, or near a hill and dig through the hill. The animal chasing you (Unless it's a bear, gorilla, polar bear or walrus) will most likely give up if you do this.