Dall’s Porpoise Skull Replica measures 11.6 inches. Dall’s Porpoise Skull Replica is museum quality polyurethane cast. Made in USA. 2-part skull (separate cranium & jaw).

Dall’s porpoise (Phocoenoides dalli) is a species of porpoise endemic to the North Pacific. It is the largest of porpoises and the only member of the genus Phocoenoides. The species is named after American naturalist W. H. Dall.

The dalli- and truei-types were initially described as separate species in 1911, but later studies determined that the available evidence only supported the existence of one species.

Currently, these two color morphs are recognized as distinct subspecies, Dall’s porpoise (Phocoenoides dalli dalli) and True’s porpoise (Phocoenoides dalli truei).

Dall’s porpoises can be easily distinguished from other porpoises and cetacean species within their range. They have a wide, robust body, a comparatively tiny head, and no distinguished beak.

Their flippers are positioned at the front of the body and a triangular dorsal fin sits mid-body. Patterns of coloration are highly variable, but Dall’s porpoises are mostly black, have white to grey patches on the flank and belly, and frosting on the dorsal fin and trailing-edge of the fluke.

They are the largest porpoise species, growing up to 7.5 ft. in length and weighing between 370 and 490 lbs.

Sexual dimorphism is apparent in body size and shape, with mature males being larger, developing a deeper caudal peduncle, and having a dorsal fin that’s significantly angled forward in comparison to a female’s.

Dall’s porpoise calves have a greyish coloration with no frosting on flippers and flukes. Calves measure about 100 cm at birth. Growth rates are similar at first, but at about 2 years old males begin to grow faster than females.

Externally, maturity is measured by length which is usually attained at 3 to 5 years old. Sizes vary between populations, but on average females reach a maximum size of 210 cm and males grow to about 220 cm, except in the southern Okhotsk Sea where males can grow as long as 239 cm.

Two colormorphs have been identified: the dalli-type and truei-type. The truei-type, found only in the western Pacific, has a white belly patch that extends farther forward across the body than that of the dalli-type.