orca

"One of the sightings reported a group of single male outer coast orcas slapping each other with their dorsal fins and charging at inner coast females."

A group of orcas in the Gulf of California has been filmed using remarkable skill to hunt young great white sharks, flipping them onto their backs to reach the nutrient-packed liver.

Keeping them in separate pools permanently is considered harmful to their wellbeing as orcas are sociable animals.

Juneau is arguably the whale watching capital of Alaska, with humpback whales traveling from Hawaii to the area every summer, along with resident and migratory orcas, so whale watching was high on our list.

The contestants deal with rough seas, strong currents, jellyfish and sundry venomous creatures, intruding fishermen, limited air, sinus crises, variable visibility and unexpected orcas.