Julie Packard discusses highlights of her four decades with the Monterey Bay Aquarium, which she has led since it opened.

You can take behind-the-scenes tours, get up close and personal with reptiles at the Turtle Experience, and attend talks to widen your knowledge and feedings. Other not-to-be-missed highlights include ...

SAO PAULO (AP) — Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense ...

Giant sloths once roamed across much of the Americas. Modern humans often picture sloths as slow animals clinging to tree branches, but their prehistoric relatives weighed more than 8,000 pounds and ...

For a long time, scientists believed the first humans to arrive in the Americas soon killed off these giant ground sloths through hunting, along with many other massive animals like mastodons, ...

"Some of the most tantalizing clues come from an archaeological site in central Brazil called Santa Elina, where bones of giant ground sloths show signs of being manipulated by humans. Sloths like ...

Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense claws.Video above: Paleontologist Thais Pansani analyzes sloth bones found at Santa ...