Humans disrupting 66 million-year-old feature of ecosystems

The U-shaped relationship between diet and size in modern land mammals could also stand for "universal," says a new study, which has found that the relationship spans at least 66 million years and a range of vertebrate animal ...

Dense bones allowed Spinosaurus to hunt underwater, study shows

Spinosaurus is the biggest carnivorous dinosaur ever discovered—even bigger than T. rex—but the way it hunted has been a subject of debate for decades. It's hard to guess the behavior of an animal that we only know from ...

Early land plants evolved from freshwater algae, fossils reveal

The world may need to start thinking differently about plants, according to a new report in the journal Science by researchers who took a fresh look at spore-like microfossils with characteristics that challenge our conventional ...

Bird brains left other dinosaurs behind

Today, being "birdbrained" means forgetting where you left your keys or wallet. But 66 million years ago, it may have meant the difference between life and death—and may help explain why birds are the only dinosaurs left ...

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