Harbor porpoises are showing up in growing numbers under the Golden Gate Bridge. Six decades ago, they were driven away in part by wartime activities and poor water quality; now, researchers are trying to understand why they're returning.
The Kemp's ridley sea turtle, which hopped a ride aboard floating seaweed, made the 4,600 mile journey from the Gulf of Mexico to the shores of Portugal in 2008. Nicknamed Johnny Vasco de Gama, after the Portugese explorer, the now-rehabilitated turtle will be reintroduced into Gulf waters Tuesday.
Damian Scarf at New Zealand's University of Otago reports in the current issue of the journal Science that experiments he conducted with colleagues show that pigeons can learn abstract rules about numbers.
Birds and wasps do it. So do octopuses, otters, polar bears and dolphins. A surprising number of animals use tools, and scientists say there are some widespread misconceptions. Among them: Using tools isn't a sign of intelligence, and animals don't need fingers to be crafty with tools.
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