Vaccines are effective in humans and other animals. The invaders were interested in humans as food animals. Chloroxylenol is toxic to many animals, especially cats. Elephants are the largest living terrestrial animals. Many fungi are parasites on plants, animals (including humans), and other fungi. Humans appear to be capable of spreading the virus to some other animals. Dettol is toxic to many animals, especially cats. Nicolas Hartsoeker postulated the existence of animalcules in the semen of humans and other animals. There are no large wild animals in Unguja. The largest land-based wild animals today are deer. The tsetse are obligate parasites that live by feeding on the blood of vertebrate animals. Fowls are the only animals they keep. Zoosadism is pleasure derived from cruelty to animals. It differs in many aspects from sexual reproduction in animals or plants. Meiosis occurs in all animals and plants.