Greg Oakley/ BIA / Rufous Whistler (Pachycephala rufiventris) male calling, Victoria, Australia

Jan Wegener/ BIA / Crested Shriketit (Falcunculus frontatus) male, Victoria, Australia

Greg Oakley / Crested Shriketit (Falcunculus frontatus), Victoria, Australia

Martin Willis / Crested Shriketit (Falcunculus frontatus), Stirling Range National Park, Western Australia, Australia

Martin Willis / Olive Whistler (Pachycephala olivacea), Lower Glenelg National Park, Victoria, Australia

Martin Willis / Olive Whistler (Pachycephala olivacea), Lower Glenelg National Park, Victoria, Australia

Martin Willis / Olive Whistler (Pachycephala olivacea), Lower Glenelg National Park, Victoria, Australia

Andy Trowbridge / Yellowhead (Mohoua ochrocephala) perched on beech tree, Blue Mountains, Southland, New Zealand. December. Endangered Species.

Greg Oakley/ BIA / Crested Shriketit (Falcunculus frontatus) male, Victoria, Australia

Rob Drummond / Gilbert's Whistler (Pachycephala inornata), Victoria, Australia

Rob Drummond / Crested Shriketit (Falcunculus frontatus) female, Victoria, Australia

Martin Willis / Rufous Whistler (Pachycephala rufiventris) male calling, New South Wales, Australia