What is a Gular Sac?
A Gular Sac is the throat pouch on some birds.
A Gular Sac is a featherless pouch, or bag, or sac, that is formed by the skin from the lower beak to the neck.
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Why do some vultures have a featherless neck?
Why do some vultures have a featherless neck – or almost featherless neck?
A vulture’s head and neck are featherless as an adaptation for hygiene.
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Somali Ostrich
The Somali Ostrich (Struthio molybdophanes) is a large bird in the Struthionidae family of ratites. It is also called the Blue-Necked Ostrich. It is a ratite, related to emus, rheas, cassowaries, kiwi, and the Masai Ostrich.
The male Somali Ostrich is a flightless black bird with white tail feathers, a featherless blue-grey neck and featherless grey thighs. The skin of the female’s neck and thighs is grey. The male’s neck and thighs become brighter in mating season. The female and young males have brown feathers. It has the largest eyes of any land vertebrate. The Somali Ostrich has two toes on each foot, whereas most birds have four toes and emus have three toes.
It cannot fly because its feathers lack the tiny hooks that lock together to make external feathers smooth for flying. Its long legs and large wings enable it to zigzag when it runs.
Masai Ostrich
The Masai Ostrich (Struthio camelus massaicus) is also called the Pink-Necked Ostrich or the East African Ostrich. It is a ratite, related to emus, rheas, cassowaries, and kiwi.
The Masai Ostrich is the largest bird in the world, growing to 2-3 metres (7-9 feet) tall. Their wingspan is about 2 metres (6.5 feet).
It is a large, flightless black bird with white tail feathers, a featherless pink neck and pink thighs. The skin of the female’s neck and thighs is pinkish grey. The male’s neck and thighs are pink, and become brighter in mating season. Females and young males are greyish-brown and white.
They have the largest eyes of any land vertebrate. Their legs have no feathers. The Masai Ostrich has two toes on each foot, whereas most birds have four toes and emus have three toes.