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.
Here you go I typed it up
these changes will be monitor with heart rate monitor and a weighing scale.
Explanation:
-the one and only kitkat
