Photo Gallery Predators Big and Small
Why are tigers, lions and leopards smaller than elephants, hippos and giraffes? Researchers think it has to do with how much energy they expend while hunting.
Bengal tigers are among the largest of all predators -- and they tend to hunt larger prey. But they are much smaller than predators of old.
Foto: REUTERS
Polar bears are the largest predators alive today. And the biggest specimens approach the upper limit for the size a predator can reach.
Foto: AP
Meat-eating dinosaurs grew to be much bigger than today's predators because of their slower metabolism, researchers believe.
Foto: DPA
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