Species such as meadowlarks, sparrows and finches suffer from blowflies. Fly sprays will kill house flies, blowflies, ants, cockroaches and other insects and also spiders. These can contribute to control of blowflies and tsetse-flies for example. Ticks, blowflies, and lice are some of the parasites with which Bicknell's thrush must contend. In North America, the Navajo make symbolic sandpaintings of blowflies, cicadas, corn bugs and dragonflies. Some blowflies, such as "Calliphora vomitoria" are known pollinators of skunk cabbage. Cochliomyia is a genus in the family Calliphoridae, known as blowflies, in the order Diptera. Other recorded parasites of the russet sparrow include "Protocalliphora" blowflies, and "Menacanthus" chewing lice. Many species of blowflies, including "Calliphora vomitoria", are known pollinators of cauliflower. Their smell has been described as foetid, and they attract blowflies. Some blowflies, such as "Calliphora vomitoria", are known pollinators. Research has been performed using synthetic trap baits instead of carcasses to capture blowflies. These blowflies are also strongly attracted during the bloat stage of decomposition. Like other blowflies, "C. vomitoria" colonize animal remains, including humans. The effect of blowflies on birds is a current research issue.