1 i like calling better
2 they have an extremly good scense of smell and if they get any wiff of it thell be long gone, they try to circle down wind to catch you scent.
3 Yes they have routes, in my area i had 2 deer that i found dead about 100 yards appart next to a real thick willow patch out in a grassy bottom. The yotes have a glazed path from the willows to the deer and back and i see them there a lot.