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Other types of STI include chlamydia, genital warts, genital herpes and trichomoniasis.

One common protozoan disease known to occur in birds, which evolved from feathered dinosaurs, as well as in people is called trichomoniasis, caused by a parasitic protozoan.

A common, parasite-caused sexual infection called trichomoniasis has been found to spread through the sharing of damp, moist objects like sponges or towels.

Pigeons, a main urban food source, can carry another threat — avian trichomoniasis, or “frounce,” which is deadly to peregrines if untreated.

In the U.S., trichomoniasis and salmonella outbreaks associated with dirty feeders are common bird killers.