The Philippine tarsier (Tarsius syrichta) is a petite, nocturnal primate that lives on a diet of insects. It is the first documented example of primate that communicates with purely ultrasonic frequencies.
Squirrel: I'm sorry to bother you but the bird feeder is empty. (A squirrel, my mother named Petey, once got on the porch railing and rang the doorbell because he wanted some peanuts!) Now I call all squirrels, "Petey"