What is the function of the hackle of a chicken?

Answer 1

The "claw" is known as a spur. The spur is a defensive appendage.

A spur is a hard bony, conical projection found on the inside of the leg of sexually mature roosters and other male birds belonging to the Order Galliformes including guinea fowl, partridges, and pheasants. The spur, used as a weapon by the bird, and for no other reason. It is an outgrowth of the leg bone and is surrounded by a cone of horn like (keratinized) material. On the male chick, the spur appears as a projection, called a papilla. As the bird matures, the papilla grows larger, hardens, and starts to curve. Some hens will develop incomplete spurring, meaning they will never get long and pointed but will be physically noticeable.

Answer 2

Most breeds of chickens possess 4 toes in an anisodactyly arrangement (with 3 toes facing forward and 1 toe facing backward), which allows them to roost and perch. However, there are some breeds, including the silkie, soultan, houden, dorking and faverolle, that have a 5th toe in front.

All of a chickens toes have claws that are used for scratching at the earth as they feed, and loosening dirt/dust to bathe in. Normally, if given ground and space on which to run and scratch a chicken's claws will remain relatively short. However, in some instances it may become necessary to trim their nails, in which case care must be taken to avoid cutting the quick (the vein within the claw.)

Roosters and some hens also grow (metatarsal) spurs, a claw-like protuberance on the back of the ankle/hock used to attack other roosters and predators. Spurs may be carefully trimmed or filed down.

In factory settings chicken are often mutilated: both the claw and part of the toe are often cruelly cut off without anesthesia to supposedly reduce injuries caused by fighting between overly stressed birds.

Answer 3

It the long feathers on a chicken's neck. They really have no specific use, except for recognition of a specific chicken.