External features of Pigeon –
Morphology – *The body of pigeon is spindle shaped (Fig.20.1) having a size of 20-25 cm. *The body is divisible into head, neck, trunk and tail. *The body is covered by backwardly directed feathers which are derivatives of feathers. *All pigeons have soft swellings (ceres) at the base of the nostrils to feed their young with "pigeon's milk" regurgitated from the crops of the parents. They also have specialized bills through …show more content…
*Each aperture opens into a canal called external auditory meatus which is closed below by the tympanic membrane.
Neck –*The neck is long cylindrical and flexible. *Neck compensates for the conversion of forelimbs into wings. *The neck is very mobile and helps in handling food and is also responsible for for the universal movement of the …show more content…
A pair of wings and a pair of legs are present in the trunk. Legs – *The forelimbs are modified into wings. *Each wing consist of three parts – branchium (upper arm), antebranchium (fore arm) and manus (hand) with three finger. During rest the wing lies on the lateral side of the trunk in a folded manner forming a’Z’ .During flight wings are expanded. The first, second and third digits of the hand remain covered in a fold of skin. The fold of skin extending between anterior portion of the branchium and antebranchium is called pre-patagium orlar membrane (Fig. 20.2).The part of the skin extending between upper arm and trunk is known as post-patagium. *From the posterior part of the trunk arise two hind limbs. Each hind limb is divided into thigh, shank and foot (Fig.20.2). Thigh is directed downwards and forwards where as shank is
Morphology – *The body of pigeon is spindle shaped (Fig.20.1) having a size of 20-25 cm. *The body is divisible into head, neck, trunk and tail. *The body is covered by backwardly directed feathers which are derivatives of feathers. *All pigeons have soft swellings (ceres) at the base of the nostrils to feed their young with "pigeon's milk" regurgitated from the crops of the parents. They also have specialized bills through …show more content…
*Each aperture opens into a canal called external auditory meatus which is closed below by the tympanic membrane.
Neck –*The neck is long cylindrical and flexible. *Neck compensates for the conversion of forelimbs into wings. *The neck is very mobile and helps in handling food and is also responsible for for the universal movement of the …show more content…
A pair of wings and a pair of legs are present in the trunk. Legs – *The forelimbs are modified into wings. *Each wing consist of three parts – branchium (upper arm), antebranchium (fore arm) and manus (hand) with three finger. During rest the wing lies on the lateral side of the trunk in a folded manner forming a’Z’ .During flight wings are expanded. The first, second and third digits of the hand remain covered in a fold of skin. The fold of skin extending between anterior portion of the branchium and antebranchium is called pre-patagium orlar membrane (Fig. 20.2).The part of the skin extending between upper arm and trunk is known as post-patagium. *From the posterior part of the trunk arise two hind limbs. Each hind limb is divided into thigh, shank and foot (Fig.20.2). Thigh is directed downwards and forwards where as shank is