More American crocodile hatchlings in Everglades National Park indicate the park’s improving health. Researchers counted almost twice as many hatchlings as last year. The park struggled in the ’70s when manmade canals allowed saltwater to seep in, and crocodiles lost much of their habitat. As the canals were plugged, the Everglades’ natural ecosystem slowly returned. Now the crocodile population is growing as their habitat returns.