Scientists at Powdermill Nature Reserve have been tracking common snapping turtles on the 2,200-acre property since 1965, safely trapping and marking a total of 72 turtles. These reptiles lay eggs in the late spring or early summer, and hatchlings like this one emerge in late summer. The turtle known as "19" at Powdermill has been tracked for more than 10 years and currently weighs more than 24 pounds. Photo: Luke Degroote