Ok, I am not supporting bestiality here. But, I just came to know about a Dogxim, a dog fox hybrid and I had known for a long time that horses and donkeys can breed (to produce a mule). So, I was just curious, can humans breed with any other animals closely related to us?
The Nazis & the Japanese experimented with this as well. AFAIK neither faction ever achieved anything resembling success. Fertilization occurs, but then immediately stops as there’s no compatibility, and the cells die.