Is it true that a mouse is bigger than an elephant....

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As animals get bigger, from tiny shrew to huge blue whale, pulse rates slow down and life spans stretch out longer, conspiring so that the number of heartbeats during an average stay on Earth tends to be roughly the same, around a billion. A mouse just uses them up more quickly than an elephant.

In the first study to measure how fast large-scale evolution can occur in mammals, scientists have calculated that it takes 24 million generations for a mouse-sized animal to evolve to the size of an elephant.

Dr David Jones, an analytical palaeontologist at the School of Earth Sciences at the University of Bristol, was a co-author on the paper which looked at 28 different groups of mammals, including elephants, primates and whales, from various continents and ocean basins over the past 70 million years. Size change was tracked in generations rather than years to allow meaningful comparison between species with differing life spans.

Becoming smaller is also easier: ... elephants; Credit: Alistair Evans · The jumbo evolution from a mouse-sized mammal to the size of elephant takes around 24 million generations, scientists calculate....

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Scientists have for the first time measured how fast large-scale evolution can occur in mammals, showing it takes 24 million generations for a mouse-sized animal to evolve to the size of an elephant.

An elephant weighs more than 200 000 times than a mouse, but needs only 10,000 times more food per day. An elephant’s metabolism is thus some 20 times more efficient. But clearly the elephant is not better adapted to its environment than the ...

A mouse, for example, cannot simply be ‘stretched out’ to be the size of an elephant. A mouse skeleton comprises a delicate framework of long, slender limb bones, connecting at angles that allow these nimble rodents to leap and bounce.