Yellowstone National Park seeks public comment on proposed measures to help stop the spread of aquatic invasive species (AIS) into park waters. The proposals include a 30-day mandatory dry time for some types of motorized boats and sailboats before entering park waters and the prohibition of watercraft previously fouled by mussels regardless of dry time.

Mosquitoes that carry viruses deadly to native birds at Haleakalā National Park. Reptiles that can grow to four or five feet in length and devour eggs of birds, alligators, crocodiles and turtles at Everglades National Park. Vegetation that can transform landscapes by not just overrunning native vegetation, but also by being more prone to wildfire.

Tegu lizards, a large invasive reptile that has turned up in Everglades National Park in Florida, can adapt to temperatures cooler than the species tolerated in its native Argentina, according to U.S. Geological Survey studies.

Looking to do some good on Earth Day, April 22? Head to Mammoth Cave National Park in Kentucky and help remove some invasive weeds while getting some fresh air and enjoying nature.