Lionheads have some unique genes that cause a wooly "mane" to grow around their neck, over their forehead, chest and shoulders (like a tiny lion). These genes can also cause wool to grow on the lower sides and the hips (a "skirt"). There are a few different factors at work that influence how and where and why this happens.
First, rabbits get half of all their genes from each parent. So a lionhead can get one copy of a gene for a mane (or a single-mane lion) or two copies of the mane gene (a double-mane lion). As a general rule of thumb, a lion with one mane gene often has a nice mane and little wool on the rest of the body as a youngster, which is desirable, but then as an adult might shed out most of its mane. A double-mane lion has a denser, thicker mane but often excess wool on the rest of its body – wool on its lower sides, hips and butt (a "skirt" - not desirable, but permissable. This is "transition wool" and is not to be over 2" in length, per the standard. If there is wool on the face below between the ears, this must not be over 1"). To have the correct coat for a lionhead, there HAS to be a clear, distinct break between the wool of the mane and any wool on the rest of the body. The break is normal fur and occurs just above the foreleg. The saddle area (over the back down to the hips and tail) must shed out any baby wool and carry normal fur also, for a showable rabbit.
Newborn double mane lionhead rabbits
Double mane lionhead rabbit kit a frw days old showing bald areas (inside red line) where wool will grow in. Single mane lionheads have normal fuzz all over and no bald areas.
baby seal point lionhead 8 weeks
blue point lionhead rabbit doe
This young lionhead doe has very long wool almost everywhere on her body. She's beginning to shed out a "break" behind her front leg and her saddle area has begun to clear.
The same rabbit from above. She has started to shed out to normal fur inside the red line but still needs to shed out the whole area within the green line.
Mature lionhead rabbit coat - adult doe with fully cleared saddle area,