The British evolutionary biologist JBS Haldane is said to have quipped that any divine being evidently had “an ordinate fondness for beetles.” This “bon mot” conveyed an important truth: the “tree of life”—the family tree of all species, living or extinct—is very uneven.



Summary

JBS Haldane famously quipped that God must have “an inordinate fondness for beetles,” highlighting the uneven distribution of species on Earth. This humorous observation points to a fundamental truth about the “tree of life”: certain groups of organisms, like beetles, are vastly more diverse than others. Haldane’s remark emphasizes that evolution hasn’t resulted in a balanced spread of life forms, but rather a skewed landscape where some lineages have exploded in variety while others remain relatively sparse. This illustrates the inherent biases in evolutionary success.

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