They have very unique mottling on their bodies, spots and blotches of different shapes and colours. In adults, the inside of the mouth is white and there is often a light-coloured or white patch near the genital slit. In the wild, killer whales have a global distribution and live in large, family groups called pods, which stay together for life and may develop their own unique dialect. Sperm whales have huge heads, especially adult males. They bow ride, breach (leap from the water) as other dolphin species do; however they are not considered to be as agile as some species. The body, to the rear of the head, is rough. Given their social behaviour killer whales are not at all suited for captivity.