Share and share alike

Today I broke up two pigeons fighting.  They were fighting over a piece of burnt bread in the road, whipping each other on the beak with their wings.  So I walked over and took the bread and broke it in two and put each piece away from each other.  Then both Pigeons approached the separated bread and one went for the closest one and pecked at it, whereas the other saw the other bread piece but decided it wanted the other bit, and the fight started all over again.