Hermann Brehm / Starling (Sturnus vulgaris) feeding young at the nesthole, Germany. May

Neil Aldridge / Woodland kingfisher (Halcyon senegalensis) flying from its nest hole in tree, Shingwedzi River, Kruger National Park, South Africa.

Gabriel Rojo / Green-barred woodpecker (Colaptes melanochloros) male at nest entrance, La Pampa, Argentina

Gabriel Rojo / Bay-winged cowbird (Agelaioides badius) pair, one bringing food to nest hole, La Pampa, Argentina

Gabriel Rojo / Bay-winged cowbird (Agelaioides badius) pair, one bringing food to nest hole, La Pampa, Argentina

Gabriel Rojo / Bay-winged cowbird,(Agelaioides badius) feeding begging chicks at nest, La Pampa , Argentina

Gabriel Rojo / Green-barred woodpecker (Colaptes melanochloros) female at nest hole, La Pampa, Argentina

Gabriel Rojo / Scimitar-billed woodcreeper (Drymornis bridgesii) with prey, Calden forest, La Pampa, Argentina.

Gabriel Rojo / Green-barred Woodpecker (Colaptes melanochloros) at nest with chicks about to hatch, La Pampa, Argentina,

Gabriel Rojo / Green-barred woodpecker (Colaptes melanochloros) male at nest hole, La Pampa, Argentina