end-Cretaceous extinction mammals large land animal niches

Dinosaur extinction opened new ways of life for mammals

Mammals lived alongside dinosaurs for millions of years, but few occupied the roles of large land animals. After the non-bird dinosaurs disappeared, many of those ecological roles became available. Mammals then spread into them without needing to have been "better" than dinosaurs beforehand.

Auction fees can earn sellers more than an item is worth

In a penny, or bidding-fee, auction, every bidder pays a fee each time they bid, including people who lose. The winner may pay far less than the item is worth, while all those fees can bring the seller more than its value.

Some New Zealand birds evolved without flight

With few mammalian predators, some native New Zealand birds evolved without the ability to fly. After people arrived, habitat changes and introduced mammals contributed to many bird extinctions, including the moa and Haast’s eagle.

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end-Cretaceous extinction mammals large land animal niches

Dinosaur extinction opened new ways of life for mammals

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