And still less widespread than the body louse, the hookworm and numerous other parasites,
Cite?
City pigeons, I believe, are all rock doves, which is one species with a lot of subspecies.
You really need a reference?
The simplest proof is simply to ask yourself whether there are houseflies in an igloo. Then ask yourself if the people or dogs have worms or lice.
Ergo worms and lice have a far greater distribution.
*Sorry, missed this one: How many species of houseflies are there, Gymnopithys?
If we’re talking about species, then these sweeping generalities don’t work.*
I meant Musca domestica. Sorry for not precising.