Chicken Fact Fact Sheet of Domestic Chicken ( Gallus gallus domesticus ) Description: Size: Varies greatly according to breed. Sizes listed are for an average breed, the Rhode Island Red. Length: 0.8-1.3 ft (25-40cm) Wingspan: 2-3 ft (60-90cm) Weight: Roosters: 8.5 lbs (3.9kg) Hens: 6.5 lbs (2.9kg) Sexual dimorphism: Males larger, with longer legs and […]