Park officials in Yosemite are warning visitors of what they say is "one of the most dangerous animals" in the park — and it's an unlikely culprit.

From Memorial Day to Labor Day, visitors will need reservations to get into Yosemite National Park on most days

If you're planning to visit Yosemite National Park during the summer, you will need to make a reservation. The body of a young Ukrainian woman who died in Russian captivity after being held incommunicado for many months was returned to Ukraine with several organs removed and showing signs of torture,