Unabashedly--and, in the drawings, sportively--the observations of a zoologist who could be Dr. Penney. ""I wanted to learn about Adelie penguins, so I went to Antarctica,"" he begins, and proceeds to describe the penguins' arrival at the rookery, how he numbered each one and its nest, what he saw during the 35 days a penguin pair takes turns sitting on the eggs and storing up food in the sea. When the chicks hatch, the parents force up food from their stomachs, which seems natural enough--and Dr. Penney is at pains to tell us also that the predatory skua ""is not a bad bird. He is just hungry. He has his own chicks to feed."" One of the few in this series to eschew a story line, this might well be one of the most successful--with children who'll find a scientist-on-the-spot more engrossing than a studied diversion.