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Adult animals are lighter in colour than most sea lions, ranging from pale yellow to tawny and occasionally reddish. Steller sea lion pups are born almost black, weighing around 23 kg (51 lb), and remain dark for several months. Females and males both grow rapidly until the fifth year, after which female growth slows considerably. Adult females measure 2. 3–2. 9 m (7. 5–9. 5 ft) in length, with an average of 2. 5 m (8. 2 ft), and weigh 240–350 kg (530–770 lb), with an average of 263 kg (580 lb). Males continue to grow until their secondary sexual traits appear in their fifth to eighth year. Males are slightly longer than the females; they grow to about 2. 82–3. 25 m (9. 3–10. 7 ft) long, with an average of 3 m (9. 8 ft). Males have much wider chests, necks, and general forebody structure and weigh 450–1,120 kg (990–2,470 lb), with an average of 544 kg (1,199 lb). Males are further distinguished from females by broader, higher foreheads, flatter snouts, and a thick mane of coarse hair around their large necks. Indeed, their Latin name translates roughly as "maned one with the broad forehead".