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Assuming both Crows and Toads have been around for hundreds of thousand, if not millions of years, why have crows just started popping toads?
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There are similar incidences in the animal behaviour literature reporting birds apparently spontaneously finding new feeding methods that you thought they'd have learnt a long time ago. No-one know why.
Another tale of bird feeding that's worth reading if you have a spare five minutes:
http://www.thecorpuscle.com/2005/04/the_cream_myth.html