Of the more than 20 species of small whales, our 300-pound playboy is indentified by his gunmetal hide, his 8 to 12 foot length and his laughing face. The porpoise has no teeth at birth; they begin to appear (from 44 to 50 in each jaw) a few weeks later. Though he suckles for about a year and a half, he begins to munch small squid at four months. He breathes through a single nostril, a crescent-shaped blowhole stop in his head that closes upon contact with water. This is also the source of his 'voice', and he can vibrate it like a human lip. His eyes, set just back from the mouth, are like a human being's, capable of 'ranging'. He hears through a cushioned inner ear and periotic bone, and has the keenest auditory sense of any animal. His brain weighs about 3.7 pounds, which in cell count per cubic centimeter is the same as man's. Some marine biologists believe that porpoises may have a higher potential IQ than man, but have never had to develop it. Because they are so perfectly adapted to their environment.

[Adapted from Scott, J.D. 'Pranksters of the Sea' in Marvels and Mysteries of the Animal World. New York : Reader's Digest Association.]

What phrases indicate that the writer has a positive attitude towards the porpoise?