PhilaZooHippo

Native to hot climates, hippos are used to this weather. But it sure is nice to have a built in pool to cool off. (credit: KYW's John McDevitt)

PhilaZooOtter

This otter is enjoying a frozen fish treat while taking a dip (credit: KYW's John McDevitt)

PhilaZooOtters

Otters catching some rays poolside (credit: KYW's John McDevitt)

PhilaZooOtter

Still working on that frozen fish treat (credit: KYW's John McDevitt)

PhilaZooPolarBear

Hot days like these can't be fun when you're wearing a fur coat and used to frigid temperatures (credit: KYW's John McDevitt)

PhilaZooPolarBear

Where's the pool? (credit: KYW's John McDevitt)

PhilaZooPolarBear3_McDevitt

Ahh relief at last. (credit: KYW's John McDevitt)

PhilaZooTurtles2_McDevitt

A mud bath is one messy way to cool off. (credit: KYW's John McDevitt)