What if I watch animal sexual acts?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

One should not watch such an act since there is no benefit in it. Yet, it may push one to what is harmful for him such as exciting his sexual desire, etc. This ruling is based on the Saying of Allah Says (which means): {Tell the believing men to lower their gaze (from looking at forbidden things), ….} [Quran 24: 30]

Thus, a Muslim should not use his sight except for what is useful for him and does not cause any harm.

However, if there is any benefit that is approved in the Sharee'ah, then one may watch such an act.

Allah knows best.