Claudio Contreras / Savannah sparrow (Passerculus sandwichensis) calling, El Vizcaino Biosphere Reserve, Baja Califonia Peninsula, Mexico, June
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Claudio Contreras / Savannah sparrow (Passerculus sandwichensis) calling, El Vizcaino Biosphere Reserve, Baja Califonia Peninsula, Mexico, June
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Charlie Summers / A Brown-headed cowbird (Molothrus ater) chick, a brood parasite, begging to be fed from a Savannah sparrow (Passerculus sandwichensis), North Park, Colorado, USA.