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Big cats like lions are susceptible to COVID-19. So are mink and some hoofed animals, like deer. So many zoos are using a vaccine specifically made for animals to try and keep their often-endangered residents healthy.

This month, zoos across the country — including the Denver Zoo — will begin vaccinating some of their animals against COVID-19. The vaccine was developed with both wild and domestic animals in mind, meaning that at some point, it will be available for pets.

"We haven't seen the cats get superexcited about seeing people, but that's honestly to be expected," says Craig Saffoe, curator of the Smithsonian's National Zoo, which reopens Friday.

Almost 30,000 people have signed a petition to keep the Denver Zoo’s polar bears together.The petition on the site Care2 calls for both bears to be sent…

Time is running out to see polar bears at the Denver Zoo -- at least for a while.This fall the zoo’s two resident bears -- Cranbeary and Lee -- are being…

Sometimes beauty is in the aye-aye of the beholder.A rare aye-aye has arrived at the Denver Zoo. The nocturnal lemur, named Tonks, was born August 8.Known…

The Cheyenne Mountain Zoo says two additional animals were killed in a hail storm early this week that caused significant damage and injured animals and...