The protozoan Trichomonas gallinae is a cosmopolitan parasite of pigeons and doves. Other birds such as domestic and wild turkeys, chickens, raptors may also become infected. The disease in pigeons is commonly called "canker". A similar condition in falcons is called "frounce. " In 2005, Trichomonas gallinae was first recognized as a cause of disease in British finches, with Greenfinch and Chaffinch most affected, although a range of garden birds have been found to be susceptible to the parasite. Recent studies have shown that up to a third of adult wood pigeons in Spain may carry the disease.