Answer: There is pollution in the east river
Explanation: If we think about it cant be a lack of food as it talks about having a large food source. Nor can it be climate change as that would result in a low yellow Perch population. it cant be they aren't able to catch the bird. So the only logical answer is a pollution that the birds are adapted to.
Answer:
Often, a knight was a vassal who served as an elite fighter, a bodyguard or a mercenary for a lord, with payment in the form of land holdings. The lords trusted the knights, who were skilled in battle on horseback
Explanation:
I just got it from my cousin
It's called a "city-state"
