An Adélie penguin bends low to check on its eggs, which are snuggled into the warm skin and feathers between its legs (look closely and you can see an eggshell peeking out). Adélies live for 15 to 20 years, and they begin breeding around age five or six. After the female lays her eggs (almost always two of them), she heads out to sea to feed. The male incubates the eggs until the female returns, often after a week or more. The eggs hatch after about a month, and soon there are fluffy gray penguin chicks everywhere.
(Photo by Chris Linder, Woods Hole Oceanographic Institution)