Piotr Naskrecki / Stalk-eyed Fly (Diopsis sp) males at lek, Gorongosa National Park, Mozambique

Piotr Naskrecki / Stalk-eyed Fly (Diasemopsis fasciata), Gorongosa National Park, Mozambique

Paul Bertner / Stalk-eyed Fly (Diasemopsis aethiopica) group at lek, Udzungwa Mountains National Park, Tanzania

Paul Bertner / Stalk-eyed Fly (Diopsidae) female compound eyes, Mount Isarog National Park, Philippines

Juergen Freund / Focus stack of Hammerhead Fly (Diopsidae) Queensland, Australia.

Chien Lee / Stalk-eyed Fly (Teleopsis sp), Taman Stutong Indah, Kuching, Sarawak, Borneo, Malaysia

Jussi Murtosaari / Flies (Brachycera) on leaf, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. June

Jussi Murtosaari / Fly (Brachycera) on Lily of the Valley berries, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. September

Piotr Naskrecki / Stalk-eyed Fly (Diasemopsis fasciata), Gorongosa National Park, Mozambique

Chien Lee / Stalk-eyed Fly (Teleopsis dalmanni) male, Kuching, Borneo, Malaysia

Tim Laman / Stalk-eyed Fly (Family Diopsidae) at rest on leaf, Gunung Palung National Park, Borneo, Indonesia

Juergen Freund / Stalk eyed fly (Diopsidae) resting on palm leaf, Philippines

Juergen Freund / Stalk eyed fly (Diopsidae) on rainforest leaf, Philippines

Juergen Freund / Stalk eyed fly (Diopsidae) on rainforest leaf, Philippines

Piotr Naskrecki / Stalk-eyed Fly (Diopsidae) on leaf, Guinea, West Africa

Piotr Naskrecki / Stalk-eyed Fly (Diopsidae) males engaged in communal courtship know as leking, rainforest, Guinea, West Africa

Phil Savoie / Stalk eyed fly, Thailand (Cyrtodiopsis whitei)

Phil Savoie / Stalk eyed flies (Cyrtodiopsis whitei) Males fight for mating rights, Thailand

Phil Savoie / Stalk eyed flies, males sparring (Cyrtodiopsis whitei) Thailand Males compete for mating rights

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) pair mating, South Africa

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) males confront each other, South Africa

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) has its eyes at the tips of long stalks much like Hammerhead Sharks, Brunei, Borneo

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) has its eyes positioned at the end of long stalks much like Hammerhead Sharks, Brunei, Borneo

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) two males fighting near food, Gombak, Peninsular Malaysia

Mark Moffett / Stalk-eyed Fly (Cyrtodiopsis whitei) two males in a face-off, Gombak, Peninsular Malaysia

Mark Moffett / Stalk-eyed Fly (Teleopsis sp) females in a single male's harem gather on rootlets near streams, Malaysia

Piotr Naskrecki / Stalk-eyed Fly (Diasemopsis sp), Gorongosa National Park, Mozambique

Piotr Naskrecki / Stalk-eyed Fly (Diasemopsis sp), Gorongosa National Park, Mozambique

Nature Production / Stalk eyed fly {Diopsidae} Sumatra, Indonesia

Emanuele Biggi / Stalk-eyed fly (Diopsidae) male, portrait, Kibale National Park, Uganda.

Emanuele Biggi / Stalk-eyed fly (Diopsidae) male, cleaning its incredibly long eye-stalks using its front legs, Kibale National Park, Uganda.