Birds' strategic mobbing fends off parasitic invaders

Reed warblers use mobbing as a front line of nest defence against parasitic cuckoos, according to a new report published online on 29th January in Current Biology, a Cell Press publication. Cuckoos act as parasites by laying their eggs in the nests of other birds, reed warblers in particular, burdening their hosts with the trouble of raising young that don't belong to them...

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