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Ground‐nesting shorebirds rely on egg crypsis as one of their main anti‐predator defence strategies. Avian embryos vocalize late in incubation and communicate with parents through the eggshell but calls may compromise crypsis. Conceivably, embryos may cease calling when exposed to signals that suggest a predator is nearby (acoustic crypsis), but this has not been studied. Signals of nearby predators...
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