David Perpinan / Great rufous woodcreeper (Xiphocolaptes major) arriving at nest site in a dead palm tree, climbs down to nest, Pantanal, Mato Grosso do Sul, Brazil.

Gabriel Rojo / Scimitar-billed woodcreeper (Drymornis bridgesii) at nest hole, Calden forest, La Pampa, Argentina.

Luiz Claudio Marigo / Rufous hornero / Ovenbird at mud nest {Furnarius rufus} Mato Grosso, Brazil

Pete Oxford / Ovenbird building nest, Pantanal, Brazil

Gabriel Rojo / Rufous hornero (Furnarius rufus) with prey in beak, on top of mud nest. Pantanal, Mato Grosso, Brazil.

Gabriel Rojo / Rufous hornero (Furnarius rufus) on top of mud nest. Pantanal, Mato Grosso, Brazil.

David Pattyn / Streak-headed Woodcreeper (Lepidocolaptes souleyetii), Los Bancos cloud forest area, Pichincha, Ecuador, July

David Perpinan / Great rufous woodcreeper (Xiphocolaptes major) entering its nest in a dead palm tree, Pantanal, Mato Grosso do Sul, Brazil.

David Perpinan / Great rufous woodcreeper (Xiphocolaptes major) startled whilst incubating eggs, Pantanal, Mato Grosso do Sul, Brazil.

David Perpinan / Great rufous woodcreeper (Xiphocolaptes major) looking inside a dead palm tree for a nest site, Pantanal, Mato Grosso do Sul, Brazil.

David Perpinan / Great rufous woodcreeper (Xiphocolaptes major) arriving at dead palm tree containing its nest, Pantanal, Mato Grosso do Sul, Brazil.

David Perpinan / Narrow billed woodcreeper (Lepidocolaptes angustirostris) arriving at nest with prey, Pantanal, Mato Grosso do Sul, Brazil.