A beaver's front teeth are bright orange because of their super hard enamel coat. These teeth must be sharp because the beaver uses them to cut down trees. Beaver's teeth never wear out because they never stop growing!
Portrait of an invader
Portrait of an invader Researchers are starting to get a clearer picture
of why the water hyacinth has been such an aggressive invader
species in Africa's Lake Victoria. There are three rivers which
feed into Lake Victoria and they inject huge amounts of
nutrient-rich sediment into the lake. These feed the weed and
promote its quick growth. 26 NOVEMBER 1999, P. 1675
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