Question

Why should we not tease animals and birds?

Answer 1

cause they don't have emotions like us to show whether they feel good or sad by our activity (teasing)..

Answer 2

People use mockery to distance themselves from animals, in order to make their abuse less ethically troubling. In the same way, people mockingly apply animal terms to people they want to exploit or displace. Farmed animals are especially likely to be mocked. Every year, it seems, some new spectacle of chicken abuse is put forward as good, clean, family fun.

Whether or not they are explicitly mocking, all uses of animals in sport or entertainment are inherently hurtful and degrading. Animals in circuses are deprived of their liberty, “trained” by abusive methods, and then forced to display their degradation for the enjoyment of others, unwilling participants in a spectacle of power and control.