size discrimination

My sister sent me this story of my niece in Iowa:


"First Annabelle and Jonah used cut grass to make a bird's nest. Then Annabelle came running inside and asked me if she could have an egg so a bird could have an egg to sit on and hatch. Then she wanted help making a sign to advertise. The sign said: 'Birds are allowed to use this nest but not big birds just little birds.'"