The morning after a fresh snowfall, you've probably once walked out of your home and spotted paw prints meandering around ...

On the right, an ephrin-B3 knockout mouse (ephrin-B3 KO) showed a different pattern. Whereas the wild-type animal shows normal alternate steps while walking, the ephrin-B3 knockout mouse moves ...

Humans' increasingly large footprint across the planet is forcing plants & animals to adapt and is affecting some species' evolutionary path.