Orca (Orcinus orca)

The Orca is the biggest representative of the dolphin family (order Cetacea, subfamily Delphinidae) and a extremely versatile predator. It is also recognised as a Killer Whale or Great Killer Whale, although it is not a whale. The Killer Whale identify is actually a corruption of the older Killer of Whales—the species is known to feed on juvenile & small cetaceans. Another term for the orca is Grampus.

Characteristics:

The orcas tend to be distinctly marked, with a black back, white chest and sides  and a white patch above and behind the eye. They have got a heavy as well as stocky shape and a large dorsal fin. The males can easily be up to nine and a half meters long (more than thirty-one feet) and weigh as much as ten tons; females usually are smaller, reaching 8.5 meters (approximately twenty eight feet) at most and a weight of seven or 8 tons. Newborns at birth weight about one hundred and eighty kilograms and are about 2.4 metres long (about 8 feet). At about 1.8m (about 6 feet), the dorsal fin of the male is usually higher compared to the female’s, and also more vertical. From a distance, juveniles and females could be confused with different dolphin and porpoise species.

Range and distribution:

Most killer whales reside in the polar regions however , they’re encountered in all oceans such as the Mediterranean sea and Arabian Sea as well as the San Juan Islands in the Usa & British Columbia, Canada. At sea they are commonly observed in pods of five to twenty-five animals, although groups of as much as 150 have been seen together.

Diet :

An Orca’s diet depends totally on availability, though pods can specialize and thus overlook possible prey. It’s believed that they need approximately 60 kilograms of nutrition every day. Their prey consists of 20 species of cetaceans, 5 species of pinniped (seals), thirty varieties of fish (especially salmon), 7 types of bird and also a couple of species of squid, in addition to a range of additional marine creatures, on occasion including larger whales like Minke Whales, Fin Whales, Gray Whales, or even young Blue Whales. Orcas will even seek out and kill Great White Sharks for their nutrient-rich livers and also to remove competitors for meals. It’s from their assaults on whales that they gained their label; they don’t attack people.

Orcas and man :

Orca are deemed to be too small for commercial whaling, although they’re occasionally killed due to the fact they are competing with humans for fish. In the 1950s the USAF, at the request of the Icelandic government utilised bombers and riflemen to slaughter orcas in Icelandic waters. The operation was considered a terrific success at the time.

In current decades, the Orca’s intelligence, trainability, striking appearance and playfulness in captivity have made orcas a well-liked aquarium and zoo attraction. This, combined with the reality that the orca isn’t aggressive towards humans, has contributed to the image of the species being rehabilitated from an target of fear like Great White Sharks to a respected predator, deserving of toleration. Orcas in captivity may possibly develop pathologies such as dorsal fin collapse, observed in over 60% of captive males.