Green when young, and about the size of an adult human's hand when full-grown, Dryococelus australis is more commonly known as the Lord Howe Island stick insect, or the tree lobster. Courtesy of Rohan Cleave/Melbourne Zoo hide caption

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Katherine Du/NPR

Wisdom, a Laysan albatross that's believed to be 65 years old, and her mate have welcomed a new chick at the Midway Atoll National Wildlife Refuge. Here, a week-old chick peeks out from its nest. Kaipo Kiaha/Paliku Productions hide caption

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While some scientists seek ways to stop the spread of Zika by mosquitoes, others have received new funding from the National Institutes of Health to track the genes and habits of the virus itself. Felipe Dana/AP hide caption

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According to legend, the Explorers Club — a society of scientific adventurers — served its members a prehistoric dish at its annual dinner in 1951. By some accounts, the mystery meat was woolly mammoth; by others, extinct giant sloth. Now DNA analysis has provided a definitive answer — and unraveled a decades-long deception. Katherine Du/NPR hide caption

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Sporadic dengue fever outbreaks in Florida in 2009 and 2010 spurred mosquito control efforts in Key West and Miami Beach, shown here. The same mosquito that carries dengue, Aedes aegypti, can transmit Zika. Joe Raedle/Getty Images hide caption

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When so-called senescent cells were removed from mice, they were healthier and lived longer than mice that still had the cells. Philippe Merle/AFP/Getty Images hide caption

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An adult spirit bear crosses a fallen log over a stream in the Great Bear Rainforest in British Columbia. Barcroft Media/Barcroft Media via Getty Images hide caption

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Kelli Fabick of Ellisville, Mo., held her mother's Australian silky terrier, Zoey, as veterinarian Sarah Hormuth gave the dog a flu shot last April. The dog flu strain H3N2 is now circulating in more than two dozen U.S. states. St. Louis Post-Dispatch/TNS via Getty Images hide caption

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