The Meaning of Life, the Universe, and Everything.
Hey i'm currently living in a Jungle Biome, I've been killing many pigs lately but i'm worried that they might not respawn and I will be in danger, since its a jungle biome there is no flatland, so no grass but leaves; meaning no seeds, so do the animals respawn?
They respawn at 1/400th the rate they used to back pre-1.8, so effectively no. What that respawn rate means is if you spend maybe 10 hours mining then you'll get a pack of animals, IF they find a place to spawn. So they do respawn, but very slowly. You should have (and I hope you did) saved two so that you can breed them with wheat (which, by the way, you can use bone meal on grass to grow tall grass if you somehow can't find any).