There is no way to check right now, but there are warning signs. If it doesn't have the Kalos Pentagon, then it comes from an older game, where it was easy to hack Pokemon. If it has a big series of max IVs, it's probably hacked (ie a 6IV Metagross or a 5IV Latias).
Tufted Titmouse are regulars at backyard bird feeders, especially in winter. They prefer sunflower seeds but will eat suet, peanuts, and other seeds as well. Find out more about what this bird likes to eat and what feeder is best by using the Project FeederWatch Common Feeder Birds bird list.
It should be noted, that contrary to some local folklore, most hawks and owls eat mostly snakes, mice, and rats, and therefore you should consider them most beneficial to have around. A couple hawks are grasshopper specialists, so also very beneficial. Owls are better rat and mouse catchers than man or cat could ever be.