Animal experimentation (vivisection), causes suffering to millions of animals. Estimates put the figure at over 115 million animals experimented on worldwide.
Animal-based experiments are cruel and exploitative. Animals are deprived of everything natural to them - they can't explore, run, scavenge, hunt, or choose a mate. As they are kept in small cramped cages, their behaviour is severely restricted, causing psychological problems - this is on top of the painful, terrifying experimentation they may endure.