Feeding time for the endangered Lake Titicaca frogs in the collections of the Denver Zoo. The frogs leap to snap at red wiggler worms but sometimes miscalculate and chomp down on a buddy's leg. In a nearby exhibit, three of these frogs are on display for the public, the only place in the northern hemisphere where they can be viewed. Credit: Stephanie Pappas / Edited by Live Science's @SteveSpaleta
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