11. Lovebirds can be mean.
Aggression isn't uncommon in lovebirds. The parrots are territorial, and are known to get along poorly with birds of another species. Within their own kind, lovebirds can also become jealous or hormonal during mating season. In captivity, they've been known to attach both other bird species and other lovebirds, with peach-faced lovebirds the most notorious for aggressive behavior.