Special birthday celebration at the Philadelphia Zoo

PHILADELPHIA ZOO (WPVI) -- There was a very special birthday celebration at the Philadelphia Zoo Thursday.

Visitors were on hand, to help wish a happy 2nd birthday to three black and white ruffed lemurs.

These three brothers, named Lincoln, Theodore, and Quincy, marked the occasion with treats and cake.

The brothers are all named from U-S Presidents, in honor of their day of birth, which falls near Presidents Day.

Black and white ruffed lemurs are native to the island of Madagascar.