Experts dissect a 65-foot, 60-ton fin whale - second only in size to its 'cousin' the blue whale - that has died after being stranded off the coast of Ireland. It's a race against time as whale anatomist Joy Reidenberg flies in from New York before the animal's decomposition causes it to explode on the beach.
The experts venture into the swamps of the Florida Everglades, where giant Burmese pythons are thriving. Many have been released into the wild by pet owners or have escaped from reptile breeding centres, and now up to 100,000 are threatening some native species with extinction.
The giant squid was long thought to be the stuff of legend. It was only in the late 19th century that it was first officially recorded by scientists, after one leviathan squid washed up on a beach in New Zealand.