such as rabbits, chickens, bugs, moths, fish, digging up earthworms, etc
the amount shouldn't be too high of course, but it should be noticeable, maybe something like 20-40 exp for each of those creatures caught? (of course the value could be adjusted if it turned out not to be a good amount)
for rare and difficult to catch things(if they are either of those), such as irrlight it could be like 2000 for each
at the beggining of world all of those could bring players a significant but not too big amount of exp, but after people progress in everything only fish that you get from nets, but that would still be useful
since those are not the typical activities that people would spend time on, those should not have diminishing returns on EXP