Question

Почему птица не тонит а другие животные тонут если не поплывут?​

Answer 1

У уток и других водоплавающих птиц имеется особая железа, расположенная в основании хвоста, которая вырабатывает жировую смазку. Птицы захватывают жир клювом и тщательно втирают его в перья. Благодаря тому, что все перья уток покрыты жиром, они не намокают. Держаться на воде птицам помогает воздух, который находится между смазанными жиром перьями и пухом

https://zooclub.ru/faq/show.php?id=3504

Answer 2

Why Birds Don't Sink and Other Animals Do

Birds don't sink when they stop flying and land on water due to several factors:

1. Buoyancy: Birds have hollow bones and air sacs that make them naturally buoyant, allowing them to float on water without sinking. - This buoyancy is due to their skeletal structure, which includes air-filled bones and a respiratory system that helps regulate their buoyancy.

2. Feathers: Birds have specialized feathers that are designed to repel water and keep them afloat. - The structure of bird feathers and their ability to trap air help provide insulation and buoyancy, preventing them from sinking.

3. Oil Glands: Birds have preen glands that produce oil, which they use to coat their feathers. - This oil helps waterproof their feathers, preventing them from becoming waterlogged and aiding in their ability to float on the water's surface.

In contrast, other animals may sink if they are not adapted for aquatic environments:

1. Density: Animals with a higher density than water will sink if they are not adapted for swimming or floating. - For example, mammals like dogs or cats have a higher density than water and are not naturally buoyant, causing them to sink if they are not actively swimming.

2. Body Composition: Animals with solid bones and less buoyant body structures are more likely to sink in water. - While birds have hollow bones and air sacs that aid in buoyancy, other animals may have denser bone structures and less buoyant body compositions, making them prone to sinking in water.

In summary, the buoyancy provided by their skeletal structure, specialized feathers, and oil glands allows birds to stay afloat on water, while other animals may sink due to their higher density and less buoyant body compositions.