Marvel: Animal Communication

Alexei Kravinoff (Kraven the Hunter)
Alexei has demonstrated the ability to communicate with animals, though the full nature of this power is unknown. It is possible that this is some form of psionic power, though it isn't known if he can only communicate with certain types of animals.

Doreen Green (Squirrel Girl)
Squirrel Girl can perfectly mimic squirrel sounds, as well as actually communicate with and direct the actions of squirrels. She oftne uses a number of squirrels to distract or even assault others, chewing through circuitry and other materials. She shares a close, possibly empathic, bond with certain squirrels, such as Monkey Joe and Tippy Toe.