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- ORCA (13)
Orcas are distinctively marked, with a black back, white chest and sides, and a white patch above and behind the eye. Calves are born with a yellowish or orange tint, which fades to white. Orcas have a heavy and stocky body and a large dorsal fin with a dark grey "saddle patch" at the fin's rear. Males can range from 6-8 m long (19-27 ft) and weigh in excess of 6 tonnes; it has been reported that especially large males have reached nearer 8 tonnes. Females are smaller, growing from 5-7m (16-23 ft) and a weight of about 5 tonnes. However, an adult orca's weight can be anywhere from 5,700 to 19,840 lbs (males are heavier then females). The largest Orca ever recorded was a male off the coast of Japan, measuring 9.8 m (32 ft) and weighed over 8 tonnes. Calves at birth weigh about 180 kg (350-500 lbs.) and are about 2.4 m long (6-8 ft). The Orca's large size and strength make them the fastest marine mammals, often reaching speeds in excess of 56 km/h (35mph).
Unlike most dolphins, the pectoral fin of an Orca is large and rounded — more of a paddle than other dolphin species. Males have significantly larger pectoral fins than females. At about 1.8 m (6 ft), the dorsal fin of the male is more than twice the size of the female's, and is more of a triangle shape — a tall, elongated isosceles triangle, whereas the dorsal fin of the female is shorter and generally more curved
2 Comments 287 weeks
The day-to-day behaviour of Orcas is generally divided into four activities: foraging, traveling, resting and socializing. Orcas are generally enthusiastic in their socializing, engaging in behaviours such as breaching, spyhopping, and tail-slapping.
Resident Orcas can also be seen swimming with porpoises, other dolphins, seals, and sea lions, which are common prey for transient Orcas. Resident Orcas are continually on the move, sometimes travelling as much as 160 km (100 miles) in a day, but may be seen in a general area for a month or more. Range for Resident Orca pods may be as much as 1300 km (800 miles) or as little as 320 km (200 miles).
0 Comments 287 weeks
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