It was the gekoes that killed them because of the DDT
Cats
In "Top of the Food Chain" by T.C. Boyle, the problem arises when the cats grow sick after eating the geckos laced with insect repellent meant to combat the mosquitoes. This causes a disruption in the food chain ecosystem on the island.
Lack of suitable food !
Defenive
Coyote food.
Owls
Cats are carnivores by nature and normally prefer fish on top of the food chain, however, they will also eat grass if not feeling well.
Geckos are not at the top of the food chain. They are at the bottom.
The geckos were full of poison
It makes fun of actions by a government.
How a quick decision can end up having serious consequences
In "Top of the Food Chain," the cats primarily ate the rats that they caught. They were skilled hunters, able to catch their prey and feed themselves in the absence of their owners.