The rowan tree is spread by what birds

This tree is generally. Sparrows or magpie birds. Just a few birds that pass by their flowers or leaves, can play some role in spreading, birds.

Birds are usually feathered, oviparous animals with a very high metabolic rate, and the long bones are mostly hollow, so most birds can fly. Birds are made up of reptiles.

Evolutionary has led to more than 9,000 species of birds living in the world, all of which have wings and feathers, including those that have lost their ability to fly (such as ostriches, penguins, etc.).

The first birds appeared 100 million years ago.

The body is spindle-shaped, the forelimbs are specialized into wings, the body surface has feathers, the body temperature is constant, the musculothoracic is developed, the bones are healed, thin, hollow, and the brain is relatively developed. Having an air bag allows for double breathing, and not having a bladder can reduce body mass. These physical traits are well adapted to flying.

Birds have no teeth but have beaks that can be used to hunt, build nests, and groom their feathers. Birds are good at building nests, and they can build all kinds of nests from the materials they collect. Ornithischia in taxonomy.

Upper is a subphylum of vertebrates.

under one of the classes. Feather.

Birds are the only animals on earth that have feathers. The vast majority of a bird's body surface is covered with feathers, which not only keep the bird at a constant body temperature, but also allow it to fly. Birds have different shapes of feathers.

Structure. The ** of a feather has a hard shaft, called the feather shaft, the upper feather part is called the feather trunk, and the lower part inserted into the ** is called the feather root. The feather trunk is flanked by feathers, which are made up of a tough substance called keratin, which in turn is made up of feathers and branchlets.

Grow. Feathers are made up of follicular vesicles on the feathers of birds**.

out, the parts are put together in a special way. Most birds moult at least once a year, when new feathers grow and old feathers fall off. Birds renew their already damaged feathers through moulting.

Freshman. Birds usually moult twice a year, which shows that feathers have a strong ability to regenerate. Scientific studies have shown that feather stem cells are distributed in a ring on the wall of the feather follicular vesicle, which can proliferate and differentiate, and the differentiated cells grow upwards to produce feathers.

The proliferation and differentiation of feather stem cells allows the entire feather organ of birds to grow and regenerate.

Type. Bird feathers can be broadly divided into four types: body feathers, down feathers, tail feathers, and wing feathers.

The body feathers cover the whole body, forming a smooth, streamlined body surface of birds; The down is fluffy, so that the warm air will not dissipate quickly; The tail feathers and wing feathers are more powerful and are used for flight.

There were 8 species of birds that visited the fruits of Rowan tree, among which the flesh-eating birds Spotted Thrush, Grey Magpie and White-backed Woodpecker had a dispersal effect on the seeds of Rowan tree, and the frequency of visits to the fruits of Rowan tree was 7 and 7 respectively