Animals

D.C.'s Rat Rangers take anyone who is interested on night time safaris through some of the Capitol's filthiest back alleys to learn the way of the rats, and to be better humans.

Scientists have found a species they've named the fire amoeba, which is capable of reproducing at 145°F and continuing to move up to temperatures of 147°F — a record for complex eukaryotic life.

The U.S. gets nearly a third of its pork from Iowa. One family is making the switch from pigs to more sustainable specialty mushrooms and trying to show other pig farmers how they did it.

The lions were found dead inside the Ngorongoro Conservation Area, a popular wildlife reserve in Tanzania. Deaths raise concerns over wildlife poisonings in East Africa.

This year's single-elimination tournament will see 16 competitors face off, compared to 12 in past years. Officials report more cubs in Katmai National Park than they've seen in recent memory.

Neuroscientists have made a major advance in modeling the human brain in mice, offering a new way to study conditions like cerebral palsy. Ethicists ask if it changes how these mice should be treated.

Antarctic krill serve as a crucial food source for penguins, seals, and whales. They recycle nutrients used by algae. Now researchers say they've found krill in a surprising place: hydrothermal vents.

An extremely well preserved fossil feather could reveal why some birds survived the dinosaur-killing asteroid, and others did not.

The Ig Nobel Prizes were awarded this week for humorous yet thought-provoking research. This year, the ceremony came with a twist.

Dawn was crowned fattest marmot by popular vote.