A few question to ask you,
Do you only feed the birds occasionally or daily morning and night be honest to your self, because if you do and you say you don’t then thats another story.
Do you only feed them nuts or you feed them with other food as well, again be honest.
Did you ask the EC if they have evidence that you are feeding the birds more than they say you do.
If there is any damages to the property due to you feeding the birds are you willing to pay the full amount and take full responsibility.
And last question about the… BY LAWS GRASS AREA, did you ask the EC about the real issue, because maybe theres more in to it than you think. I have learn from the fast experience that there is always two side of the story, maybe you should ask both side and make your mind up after instead of listening to just one person.