Crucigrama Animal classificationVersión en línea Revision of animal classification por ioanna ziaka 1 insects belong to this category 2 animals with a spinal column 3 insects have this 4 they live both on land and in water 5 these animals have to watch where they go 6 snakes belong to this category 7 words that give birth to young animals 8 birds use these to keep their body warm 9 fish have these 10 fish breathe with these 11 mammals use this to regulate their body temperature 7 3 8 2 1 10 11 5 9