Leopards reach sexual maturity at the age of two and a half to four years. Male leopards are attracted to a female on heat by the smell of her urine. During the courtship period the pair may stay together for several days and even share food. The copulate frequently. The male will bite softly on the back of the neck of the female during mating. At the end of copulation the female will often turn around growl, and act, what appears to be aggressively towards the male. Mating leopards, as with lion, can be unpredictable and dangerous. The gestation period is about 100 days and litter size averages three, but can be as many as six cubs.