The arctic tern carries out the longest migration of any creature on Earth a journey of more than 36,000 kilometres (or 22,000 miles) from the Arctic to the Antarctic and back again, each year!
Short in the tooth
Short in the tooth A combination of changes in the Earth's climate
over many millions of years may have caused an increase in tougher
grasses on the prairies, which could have contributed to the
decline of grazing species found in North America. Tougher grasses
would have worn down the teeth of grazers faster than soft grasses,
meaning that grazing species with shorter teeth would wear their
teeth out faster than those with longer teeth. The shorter toothed
species would then have shorter lives and produce fewer offspring
than longer toothed species, leading to their decline. 15 AUGUST 1998, P. 11
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