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Deterrent devices, such as sonic units and bird spikes, discourage birds from landing or roosting in an area by presenting a physical obstacle or causing discomfort and annoyance for the target bird. Exclusion devices are 100% effective when installed correctly, as they entirely prevent birds from physically entering the treated area.
Birds can produce large quantities of unsightly and unhygienic feces, and some birds have very loud calls that can be inconvenient for nearby residents, especially at night. As a result, bird control spikes are used to deter these birds without causing them harm [2] or killing them. In an unexpected adaptation, some birds have collected the ...
Scarecrows in a rice paddy in Japan. A scarecrow is a decoy or mannequin that is often in the shape of a human. Humanoid scarecrows are usually dressed in old clothes and placed in open fields to discourage birds from disturbing and feeding on recently cast seed and growing crops. [1]
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In economics, a good, service or resource is broadly assigned two fundamental characteristics; a degree of excludability and a degree of rivalry. Excludability was originally proposed in 1954 by American economist Paul Samuelson where he formalised the concept now known as public goods, i.e. goods that are both non-rivalrous and non-excludable. [1]
Scarcity plays a key role in economic theory, and it is essential for a "proper definition of economics itself". [3] "The best example is perhaps Walras' definition of social wealth, i.e., economic goods. [3] 'By social wealth', says Walras, 'I mean all things, material or immaterial (it does not matter which in this context), that are scarce ...
Human-wildlife interactions have occurred throughout man's prehistory and recorded history. An early form of human-wildlife conflict is the depredation of the ancestors of prehistoric man by a number of predators of the Miocene such as saber-toothed cats, leopards, and spotted hyenas.
Members of the last generation to live under unabashed Jim Crow are among voters in a historic presidential election that has been roiled by racial and other divisions.