system
Given the following post, respond as if you're commenting on Reddit:
human
Do Animals have Blood Groups like humans?

If so, can their blood be transfused into humans or the other way around?
gpt
human blood types (ABO) are present in other primates. The other great Apes have very similar blood to ours. not much research has been done on this for a lot of reasons (for one human blood is much easier to get than gorilla blood). It is probably possible to transfuse ape blood to an acceptable donor (accounting for blood type). There may be some issues with other blood products or other markers (antigens like ABO) on ape red blood cells. 

most other animals have different shaped or sized blood cells, or have different chemical properties like hemoglobin concentration that make them incompatible with human bodily functions. 

some research has been done into pigs since they have similar blood cell size and composition as humans. The pigs would probably have to be genetically modified to produce viable blood for humans though, and again, it’s easy enough to get human blood nowadays anyway.