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Then, these insect groups developed ways of feeding on flowering plants. Adaptive radiations commonly follow mass extinctions. After an extinction event, many niches are left vacant.
They now outnumber all other forms of animal life by quite a margin. A classic example of this is the replacement of the non-avian dinosaurs at the end of the Cretaceous with mammals in the Palaeocene.
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Opportunities occur when land bridges form between areas which were previously separate, and whenever species get to new place in the world.
In Lake Victoria, an isolated lake which formed recently in the African rift valley, over 300 species of cichlid fish radiated from one parent species in just 15,000 years. Species A migrates from the mainland to the first island. Isolated from the mainland, species A evolves to species B.
Amphibians, who branched off before this event, still lay their eggs in water, and so are limited in the extent to which they can exploit land environments. By potassium/argon radioactive dating, the present islands date from 0.4 million years ago (mya) (Mauna Kea) to 10mya (Necker).
Evolution of this character has thus increased the number of ecological niches available to mammals. The Hawaiian islands plus former islands which are now beneath the sea make up the Hawaiian–Emperor seamount chain; and many of the underwater mountains are guyots.i have apparently descended from a single ancestral species that colonized the islands, about 20 million years ago.many lines underwent rapid radiation simultaneously. This must have something to do with the availability of ecological niches and relative absence of competition.