Black Australorps are one of the most popular producers of large brown eggs and are known for their persistence in laying - even in hot weather. When mature, these birds have glossy, all-black feathers that show a gorgeous green sheen, particularly in the sunlight. From the time these chicks hatch until they are fully grown, their feathers have white tips. Average mature weight: hens 5 lbs. The Pullets are fully vaccinated, beak trimmed, floor raised and ready to move into your laying barn.