WHY CHICKEN AND ZEBRA CROSSING

I'm free at last the chicken thought
To cross the road without getting caught
No questions will be asked of him why 
The chicken was so happy he began to cry

On another road the zebra thought the same
Crossing it without any restrictions or blame
The zebra's road crossing was black and white
Everything was good for him he felt alright 

The roads are empty now as I'm sure you know
Zebras and chickens are free to come and go
Both can cross their roads all over the place
I wonder if they think where's the human race