Why does a big elk sound so puny?

Why does a big elk sound so puny? – CBS News Watch CBS News In this animated video essay, “Sunday Morning” contributor Robert Krulwich and animator Nate Milton go inside one of Nature’s mysteries, to examine why an adult male elk, weighing around half a ton, makes such an uncharacteristically high-pitched sound. View CBS News

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Endangered Mexican long-nosed bats now being tracked via “eDNA” using their saliva

Flagstaff, Arizona — Scientists have long suspected that Mexican long-nosed bats migrate through southeastern Arizona, but without capturing and measuring the night-flying creatures, proof has been elusive. Researchers say they now have a way to tell the endangered species apart from other bats by analyzing saliva the nocturnal mammals leave behind when sipping nectar from

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