The bot flies and warble flies are an impressive and actually seldom seen group. As adults anyway. Family is Oestridae and there are only about 40 species in North America. I have only seen two free-flying adults. Though, granted, I have never owned large animals. Perhaps keepers of horses and cows and sheep see the adults more often during their short flight time. These adults do not feed so they only live as long as they can on the fat stores they come with.

This one took up a post on this large (and bright white) patch of heron poop on a creek in Arkansas. Seemed to be waiting for something. I cannot tell the sex on these things. There are only six genera in NA. They are Cuterebra (26 species) which parasitize the flesh of rodents and rabbits. Gasterophilus (4 species) which parasitize horses. Hypoderma (3 species) which parasitizes cattle in two and in one Caribou. Oestrus (1 species) which prefers the noses of sheep and was imported from Europe. Cephenemyia (6 species) which choose their particular cervid (deer, elk, moose). Suioestrus (1 species) which likes a nice pig. Here is the short key from the Nearctic Diptera catalog.

By the wing veins this seemed to be a Cephenemyia but Eric Eaton said that it appeared to be a Cuterebra species. Eric is usually right and the prominent scutellum suggests he is. Geroge Boettner subsequently diagnosed another bot in my yard as in this genus. It was similar but likely a different species.

The fourth or fifth bot adult I have now seen I guess, in June of 2014. This was at Camp Robinson Military reservation. Landed on the back of our truck. And I had my better camera and this one was fearless. I had no excuses. This looks so fresh not a hair is out of place. Almost certainly a Cuterebra as well. I believe now I have only seen members of this genus.