A mouse’s sperm is much, much larger than an elephant’s sperm. A fruit fly produces the longest sperm known to science. Why do tiny animals make big swimmers, but large animals make small ones? There ...

‘New mouse species has elephant DNA,’ declared the headlines. It must have been hard to resist, considering the contrast in size between these animals. The wording conjures up images of runt elephants ...

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If you're a fan of elephants and tiny things (which, let's face it, everyone is), then you will be as excited by this as we are: scientists in California have discovered a new species of mammal called ...

What species is better at fighting an infection, a mouse or an elephant? Body size is one of the most noticeable differences among species, but relationships between immune defenses and body size have ...

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 ...