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A drinking bird, also known as the dunking bird, drinky bird, water bird, and dipping bird, [1] [2] [3] is a toy heat engine that mimics the motions of a bird drinking from a water source. They are sometimes incorrectly considered examples of a perpetual motion device.
Scientists in Hong Kong and China have used the famous toy, also known as the “Dippy Bird,” to develop an engine capable of using the power of water evaporation to generate electricity ...
A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
Sizes range from 14–22 cm (5.5–8.7 in) in length and 40–90 g (1.4–3.2 oz) in weight, with males larger than females. Their short wings give them a distinctive whirring flight. [8] [9] [10] They have a characteristic bobbing motion when perched beside the water, giving them their name. While under water, they are covered by a thin ...
Avian foraging refers to the range of activities and behaviours exhibited by birds in their quest for food. In addition to their unique body adaptations, birds have a range of described behaviours that differ from the foraging behaviours of other animal groups. According to the foraging habitat, birds may be grouped into foraging guilds ...
Human uses of birds have, for thousands of years, included both economic uses such as food, and symbolic uses such as art, music, and religion. In terms of economic uses, birds have been hunted for food since Palaeolithic times. They have been captured and bred as poultry to provide meat and eggs since at least the time of ancient Egypt.
Karl von Frisch's work established that bees can accurately identify the direction and range from the hive to a food source (typically a patch of nectar-bearing flowers). A worker bee returns to the hive and signals to other workers the range and direction relative to the Sun of the food source by means of a waggle dance .
The crop (also the croup, the craw, the ingluvies, and the sublingual pouch) is a thin-walled, expanded portion of the alimentary tract, which is used for the storage of food before digestion. The crop is an anatomical structure in vertebrate animals, such as birds , and invertebrate animals, such as gastropods (snails and slugs), earthworms ...
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