Science

An orange clownfish, Amphiprion percula, lives in symbiosis with a host anemone on the Great Barrier Reef. Alejandro Usobiaga/Scientific Reports hide caption

Locals have been tweeting photos of fire ant colonies drifting aimlessly in the floodwaters of Hurricane Harvey. Juan DeLeon/Icon Sportswire/Getty Images hide caption

Volunteers unload one of 35 dogs flown from Texas shelters to Seattle in Hurricane Harvey's aftermath. The dogs arriving in Seattle were already in Texas shelters when Harvey hit and are being transferred so animals displaced by the flooding can be cared for until they can be reunited with their families. Elaine Thompson/AP hide caption

The typical asymmetrical lymphedema (lower limb swelling) seen in podoconiosis. The skin on the affected limbs is thickened with warty and mossy nodules. The toes are disfigured with joint fixation typical of advanced podoconiosis disease. Christine Kihembo/ASTMH & AJTMH hide caption

Tiny turtles are cute, but they can spread salmonella and make children very sick. susan.k./Getty Images hide caption

Volunteers organize stacks of donations that were dropped off Tuesday at the North Dallas location for Hurricane Harvey victims. Tony Gutierrez/AP hide caption

These dead sharks were discovered aboard a Chinese-flagged vessel found off Ecuador earlier this month with some 300 tons of marine species, several of which are in danger of extinction. Galapagos National Park via AP hide caption