Treeswifts are small birds. 

Treeswifts are small birds with long tails. 
Treeswifts are small birds that fly through the air. 
These birds are 15 to 30 cm long. They have long wings and long, forked tails. Many have a crest, which is a tuft of feathers on the head. Treeswifts are different from true swifts. They have a special toe that helps them perch on branches.
Treeswifts live in many places. The whiskered treeswift stays in thick forests. The grey-rumped treeswift lives in many spots. It can live in mangrove forests or hill forests. All treeswifts eat insects.
Both parents help build the nest. They glue one egg to a tree branch. The egg can be white or grey. When chicks hatch, they have grey down. This is a soft covering of feathers. The parents feed the babies by giving them food from their mouths.
Treeswifts are a special family of birds. They belong to the group called Hemiprocnidae. These birds spend much of their time in the air. They are closely related to true swifts. However, they have many unique features. 
These birds have a very interesting way of working. Their wings look very long when they fly. Most of that length comes from the primary feathers. Their actual arms are quite short. They also have long tails that are forked. Many treeswifts have a crest on their heads. This is a tuft of feathers. They have softer feathers than true swifts. One special part is their back toe. This toe cannot move in reverse. This helps them perch on tree branches. True swifts cannot do this easily.
Treeswifts live in many different kinds of homes. The whiskered treeswift likes primary forests. This bird stays close to plants under the canopy. It does not like to fly over open ground.
Building a home is a big job for these birds. The male and female share the work. They build a nest on an open tree branch. They use a special glue to hold it there. They only lay one egg at a time. This egg might be white or grey. We do not know exactly how long they sit on eggs. We think larger species take more time. When chicks hatch, they have grey down. This is a soft layer of feathers. Parents feed them a bolus of food. This is food they have brought up from their own mouths.
Learning about treeswifts helps us see how birds adapt. They use their bodies to fit their homes. A bird with a special toe can sit on a branch. A bird with long wings can fly through the air. 
Treeswifts are a unique family of aerial birds known as Hemiprocnidae. They are closely related to the group known as true swifts. However, they belong to their own distinct genus called Hemiprocne. This family contains only four specific species of birds. They are found across a wide range of tropical regions. Their habitats span from India and Southeast Asia to Indonesia. They also live in New Guinea and the Solomon Islands. 
These birds have very specific physical traits that set them apart. Most treeswifts are small or medium in size. They typically measure between 15 and 30 cm in length. Their wings look exceptionally long during flight. This is because most of the length comes from the primary feathers. Their actual arm bones are actually quite short. They also possess long, forked tails and softer plumage than true swifts. Many species feature facial ornaments or crests on their heads. Males often show iridescent mantle plumage on their backs.
Anatomy explains why treeswifts can live differently than true swifts. They have diastataxic wings, which means they lack a fifth secondary feather. This is different from the eutaxic wings found in the Apodini group. Their skeletons also show differences in the palate and the cranium. One major difference is found in the anatomy of the tarsus, or leg bone. Treeswifts have a nonreversible hind toe. This special toe allows them to perch on tree branches. True swifts are unable to engage in this perching activity.
Different species of treeswifts have chosen very different habitats. The whiskered treeswift prefers living in primary forests. It is highly manoeuvrable and feeds on insects near vegetation under the canopy. This species rarely enters secondary forests or plantations. It will never fly over open ground. 
Reproduction and nesting are important parts of their life cycle. Both the male and the female share the responsibility of building a nest. They build their nests by gluing them to an open tree branch. Each nest contains only one egg. These eggs can be either white or grey in color. Scientists do not have much information regarding exact incubation times. However, it is thought that larger species require longer periods to hatch. When the chicks finally hatch, they are covered in grey down.
Feeding the young requires a specific process. The parents provide food to the chicks in a special way. They deliver a bolus, which is a mass of regurgitated food. This allows the chicks to receive nutrients directly from the parents. While we know they all eat insects, scientists have not studied the exact types of prey they take. This shows how much there is still to learn about their specific diets. 
Understanding treeswifts helps us see the diversity of avian evolution. Their specialized toes and wing structures show how birds adapt to specific environments. Some species evolved to stay deep within the forest canopy. Others evolved to thrive in coastal mangroves or hilly terrain. These birds demonstrate how small changes in anatomy can lead to entirely different lifestyles. By studying the Hemiprocnidae, we learn more about how birds occupy different roles in the natural world.
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