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In an intriguing sidelight, Colinvaux writes of , the dinosaur most often portrayed as stalking about on its hind legs, hideous teeth bared.Colinvaux notes that more recent reconstructions of the tyrannosaur picture the beast as relatively inactive, spending most of its time lying on its belly (conserving energy), feeding on the sick and dying or on carrion.This makes it impossible for the big animal to consume all the others in the food web.
He comments: “I take the opportunity to brand as nonsense tales of destroying the atmosphere, killing lakes, and hazarding the world by making it simple.” If there is a bias in the book, it could be labeled pro-Darwinian.
In discussing how every species has its niche in the scheme of things, Colinvaux talks of the wolf-spider in the graceful, often amusing style that is characteristic of the book: “Wolf-spidering is a complex job, not something to be undertaken by an amateur.
We might say that there is a profession of wolf-spidering.” This concept—that every species has its niche—and the resulting impact on breeding strategy implies limits to the size of population of a given species and a struggle to decide which family strains will occupy the limited number of spaces in the world.
In his research, Kern and Grigg adds that when the big fierce animal cannot harm those predators that might harm him (Kern & Griggs, 2005).
Because of this reason, predators make sure they escape possible dangers when getting food.