Tunas did not become large, fast and warm-blooded simply because an asteroid cleared the oceans of competing predators. Their defining traits appeared separately over tens of millions of years, ...

Scientists have used DNA and RNA from a preserved thylacine (Tasmanian tiger) head to reconstruct nearly the entire genome of the extinct species. While this advances efforts to potentially revive ...

Ichthyosaurs were the main predators of the oceans millions of years ago. Like reptilian dolphins with a mean streak, they grew between 10 and 43 feet long and had a long snout armed with viciously ...

Conservationists often raise the young of endangered species in captivity before releasing them into suitable habitats as adults. The benefits are obvious: survival to adulthood is typically high, as ...

Scientists are starting to reintroduce a 20-legged predator to kelp beds off Washington state after an underwater pandemic nearly wiped it out.