Mark Moffett / Goat Fly (Phytalmia mouldsi) males clashing antlers while fighting, Queensland, Australia

Heather Angel / Common bee fly (Bombylius major) nectaring on Goat willow (Salix caprea) catkin. Surrey, England, UK. March.

Mark Moffett / Goat Fly (Phytalmia mouldsi) professor Gary Dodson adds extensions onto a male's antlers to see if this increases his success in battle, Ball State University, Indiana

Mark Moffett / Goat Fly (Phytalmia mouldsi) male flies eye to eye as they guard females using oviposters to deposit fertilized eggs, Queensland, Australia

Mark Moffett / Goat Fly (Phytalmia mouldsi) male in courtship posture, Queensland, Australia

Joel Sartore / Photo Ark / African shikra falcon (Accipiter badius sphenurus) portrait, Sheikh Butti bin Juma Al Maktoum Wildlife Centre. Captive, occurs in Africa.

Juergen & Christine Sohns / Northern Goshawk (Accipiter gentilis), Bohemian-Moravian Highlands, Czech Republic

Juergen & Christine Sohns / Northern Goshawk (Accipiter gentilis), Bohemian-Moravian Highlands, Czech Republic

Donald M. Jones / Sharp-shinned Hawk (Accipiter striatus), Montana

Scott Leslie / Sharp-shinned Hawk (Accipiter striatus), Nova Scotia, Canada

Roland Seitre / Eurasian Sparrowhawk (Accipiter nisus) on antenna, France

Roland Seitre / Eurasian Sparrowhawk (Accipiter nisus) on antenna, France

Robin Chittenden / Sparrowhawk (Accipiter nisus) calling to young nearby, Norwich, UK. July.

Konrad Wothe / Female Sparrowhawk (Accipiter nisus) perched in a tree clutching its prey, Germany, Europe. May

Konrad Wothe / Female Sparrowhawk (Accipiter nisus) perched in tree clutching its prey, Germany, Europe. May.

Markus Varesvuo / Goshawk (Accipiter gentilis) in snow, Mainua Kajaani, Finland. March.

Markus Varesvuo / Goshawk (Accipiter gentilis) sitting on a branch, Mainua Kajaani, Finland. March.