Glenn Bartley/ BIA / Acorn Woodpecker (Melanerpes formicivorus), Costa Rica

Alan Murphy / Acorn Woodpecker (Melanerpes formicivorus), Arizona

Glenn Bartley / Acorn Woodpecker (Melanerpes formicivorus), Costa Rica

Marie Read / Acorn Woodpecker (Melanerpes formicivorus), male at granary tree showing many acorns stored for winter survival, Orange County, California, USA

Tom Vezo / Acorn Woodpecker (Melanerpes formicivorus) female, Madera Canyon, Arizona

Tom Vezo / Acorn Woodpecker (Melanerpes formicivorus) female bringing food to nest cavity, Madera Canyon, Arizona

Rolf Nussbaumer / Acorn woodpecker {Melanerpes formicovus} Male, Madera Canyon, Arizona, USA.

Alan Murphy/ BIA / Acorn Woodpecker (Melanerpes formicivorus) pair, Arizona

Nick Hawkins / Acorn woodpecker (Melanerpes formicivorus) Talamanca Range, Talamanca Range-La Amistad Reserves / La Amistad National Park UNESCO Natural World Heritage Site, Costa Rica.small repro only

Steve Gettle / Acorn Woodpecker (Melanerpes formicivorus) female, Belize

Marie Read / Acorn woodpecker (Melanerpes formicivorus), female clings upside down in Coast live oak (Quercus agrifolia) to gather an acorns Bear Valley Trail, Point Reyes, California, USA. October 2014.

Marie Read / Acorn woodpecker (Melanerpes formicivorus), female carrying acorn in flight, Mount Diablo State Park, California, USA.