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