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Lack of suitable food !
It was the gekoes that killed them because of the DDT
Geckos are not at the top of the food chain. They are at the bottom.
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.
The geckos were full of poison
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.
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.
A domestic cat is just below a dog in the food chain. However, in the wild, big cats are generally at the top.
A bear on the top of the food chain.
a hawk can be at the top of the food chain. Also a owl can be at the top of the food chain.
I think that they are at the top of the food chain.