most interesting of our american birds

The Birds are endangered. They were once so free living their lives peacefully. The question in poem is that is it nature who is killing them off or is it the human race. Now this part right here "the same who
would destroy itself to feed its young -- to
destroy its eggs as it sat on them within its
nest to incubate & protect them." Okay this is profound the pelican were once living so well that they wanted their children to have the same life they did. But now that they are being destroyed by man and oil leakage they are killing their unborn so that they don't go though the same pain they went though essential protecting them. Then we humans realize this but it is too late the damage is done already. What can we do?