There were also two different type of bird offerings eligible for sacrificing:
1. Mature turtledoves
2. Young doves
These two birds are also prayed on by other animals, Hashem is showing us again how He sides and favors the victim and not the attacker.
Moreover, why are only mature turtledoves and young doves permitted for sacrifice?
When a turtle dove matures, and the female mate’s die, she stays loyal to her lost mate and never connects with another bird again. This is parallel to Bnai Israel who stays loyal and committed to Hashem no matter the circumstances. Moreover, mature doves are not kosher sacrifices because they become extremely overprotective of their mates and instigate needless contention.