Zookeeper Dave Johnson talks to the crowd about Bert, who lives with one other hippo, his son. (credit: CBS)
Bert, The Denver Zoo's Hippo, Turns 58
New genetic research, zookeeper Dave Johnson says, indicates hippos are closely related to dolphins and whales. (credit: CBS)
Bert, The Denver Zoo's Hippo, Turns 58
Crowds watch zookeeper Dave Johnson feed Bert. (credit: CBS)
Bert, The Denver Zoo's Hippo, Turns 58
A zoo visitor signs a birthday card for Bert. (credit: CBS)
Bert, The Denver Zoo's Hippo, Turns 58
Bert weighs roughly 5,000 pounds. (credit: CBS)
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