beached specimens have been accurately measured. From nose to tail, the adult female was approximately 4.4 meters (~14.5 feet), while the adult male was 3.9 meters (~13 feet). The other three specimens were juvenile males, which measured between 2.1-2.4 meters (~7-7.5 ft). The rostrum of Perrin's beaked whales are relatively short compared to all other species in the genus, except for M. hectori and M. peruvianus. The rostrum of calves appears to be shorter and stubbier than adults. The teeth are fairly large and towards the tip of the mouth. The blowhole is broad and crescent-shaped, with the tips pointing anteriorly (toward the front/head; see blowhole image). The melon forms a small bulge, the mouthline is straight, and throat grooves are present. Adult males are dark gray dorsally (on back) grading to white ventrally (on stomach). The ventral side of the tail flukes are light gray with converging striations and a white patch around the umbilicus (navel). The coloration of females is not known, since the only specimen was moderately decomposed. Calves are light to dark gray dorsally and white ventrally. The lower jaw and throat regions are white. A dark gray region extends from the corner of the mouth and encompasses the eye and the rostrum, forming an extended mask. The flippers are medium to dark gray dorsally and white ventrally. There is a lighter-colored patch on the anterodistal portion. The flukes are dark gray dorsally and medium to light gray ventrally. The ventral surface includes a pattern of white striations that converge posteromedially. A photograph of a possible living specimen - one of the two observed in 1976 - is featured in Rice (1978: 95) as "Mesoplodon carlhubbsi", a distinctly larger species also native to the waters off California. Recordings of the animals' vocalizations were also gained during this opportunity. In Perrin's beaked whale, the teeth are located near the tip of the lower jaw and are roughly equilateral triangles when viewed laterally (from the side) in the jaw, which resembles the font teeth of Baird's beaked whale (Berardius bairdii) more than other Mesoplodon species. Like other mesoplodont whales, male M. perrini have a set of tusk-like teeth that originate from the lower jaw (see image). These tusks are not present in females. A series of long, white scars along the flank of the adult male specimen brought to the conclusion that tusks may play a role in