Like all crocodiles, they are sexually dimorphic, with the males up to 30% larger than the females, though the difference is considerably less compared to some species, like the saltwater crocodile. Male Nile crocodiles are about longer on average at sexual maturity and grow more so than females after becoming sexually mature, especially expanding in bulk after exceeding in length. Adult male Nile crocodiles usually range in length from long; at these lengths, an average sized male may weigh from . In Limpopo, South Africa, males reportedly average . Very old, mature ones can grow to or more in length (all specimens over from 1900 onward are cataloged later). Mature female Nile crocodiles typically measure , at which lengths the average female specimen would weigh .