Thousands of goldfish were spotted in March in Teller Lake #5 off Arapahoe Road in Boulder, Colorado, and biologists are concerned. Here's a look at the fish-filled lake.
Killer shrimp, creatures that indiscriminately slay other animals without eating them, may soon join the list of invasive species living in the Great Lakes, a new study finds.
Once down to only 15 animals, giant tortoises on Espãnola, a tiny Galápagos island, now number about 1,000, making the reptile one of conservation's greatest success stories.
An amazing video from the Florida Keys shows a curious domestic cat nearly become a midnight snack for an American alligator.
An invasive species of camel cricket from Asia is now far more common in American basements than the native variety, a citizen science project found.
When other predatory fish quit stalking their prey to look for easier targets, lionfish just keep on killing.
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