It provides fascinating details on the biology of each species, on care of the species in captivity, and provides distribution maps for each species in the Hawaiian Islands. Strangely, McKeown just doesn't seem to grasp the concept that generalist species of tree frogs are likely to undergo population explosions in island ecosystems which are lacking in native tree frogs. These generalist tree frog species are going to depend on insects for their food supply, and some of them are likely to invade high-elevation rain forests where native Hawaiian forest birds depend on native insects for food. He considers the Brown Tree Snake an anomaly. Virtually all other snakes are specialized as to where they can live and what they can eat.
Most snakes feed on rats and mice and benefit mankind.
No other snake has caused the extinction of a single species of animal anywhere in the world. Yet most of us wouldn't have heard of the Brown Tree Snake if it hadn't by chance been transported to the island ecosystem of Guam 50 years ago, established and spread over the island, and built up populations 10-50 times as large as in its native habitat. Regarding the potential impact of invasions in Hawaii, we are only beginning to realize the potential consequences. Transport of heretofore obscure species from place to place is accelerating at an alarming rate. I do not believe Hawaii's laws are sufficiently restrictive to prevent further devastating alien introductions, yet all snakes and most tree frogs are prohibited, as they should be.