A bear of a birthday

WEST PHILADELPHIA (WPVI) -- Happy 4th birthday to a furry Philadelphian at the zoo.

Thursday is Kayla the female sloth's birthday.

To celebrate guests sang "Happy Birthday" and watched as Kayla and her mate Bhalu, ate special treats including a "beary" yummy cake.

You can keep the party going all weekend and learn more about sloths each day at noon when the zoo keeper gives a free chat.