Marie Read / Scissor-tailed Flycatcher (Tyrannus forficatus) calling and displaying with wings and tail outspread, Wichita Mountains National Wildlife refuge, Oklahoma, USA, May

Jim Brandenburg / Prairie burn in Tallgrass Prairie National Preserve, Oklahoma

Tim Fitzharris / Pine (Pinus sp) tree, Mount Scott, Wichita Mountains National Wildlife Refuge, Oklahoma

Tim Fitzharris / Lichen on rocks, Mount Scott, Wichita Mountains National Wildlife Refuge, Oklahoma

Tim Fitzharris / Pine (Pinus sp) tree at night, Mount Scott, Wichita Mountains National Wildlife Refuge, Oklahoma

Tim Fitzharris / Pine (Pinus sp) tree, Mount Scott, Wichita Mountains National Wildlife Refuge, Oklahoma

Tim Fitzharris / Pine (Pinus sp) tree at night, Mount Scott, Wichita Mountains National Wildlife Refuge, Oklahoma

Tim Fitzharris / Sand Creek, Great Sand Dunes National Park, Colorado

MYN / Andrew Snyder / Juvenile Grass pickerel (Esox americanus) Oklahoma, USA, April. Meetyourneighbours.net project

MYN / Andrew Snyder / Juvenile Grass pickerel (Esox americanus) Oklahoma, USA, April. Meetyourneighbours.net project

John Abbott / Oklahoma Clubtail dragonfly (Gomphus oklahomensis) male at rest, Sam Houston National Forest, Texas, USA, April

Marie Read / Summer Tanager (Piranga rubra) female perched beside male in breeding plumage, spring, Wichita Mountains National Wildlife Refuge, Oklahoma, USA, May