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Dogs have made 11 vertebrate species extinct and are identified as a 'potential threat' to at least 188 threatened species worldwide; [162] another figure is that dogs have also been linked to the extinction of 156 animal species. [163] Dogs have been documented to have killed a few birds of the endangered species, the kagu, in New Caledonia. [164]
Tardigrade anatomy. Tardigrades have a short plump body with four pairs of hollow unjointed legs. Most range from 0.1 to 0.5 mm (0.004 to 0.020 in) in length, although the largest species may reach 1.3 mm (0.051 in).
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The hearing ability of a dog is dependent on breed and age, though the range of hearing is usually around 67 Hz to 45 kHz. [22] [23] As with humans, some dog breeds' hearing ranges narrow with age, [24] such as the German shepherd and miniature poodle. When dogs hear a sound, they will move their ears towards it in order to maximize reception.
A drawing by Konrad Lorenz showing facial expressions of a dog - a communication behavior. X-axis is aggression, y-axis is fear. Dog behavior is the internally coordinated responses of individuals or groups of domestic dogs to internal and external stimuli. [1] It has been shaped by millennia of contact with humans and their lifestyles.
Prairie dog tunnel systems channel rainwater into the water table, which prevents runoff and erosion, and can also change the composition of the soil in a region by reversing soil compaction that can result from cattle grazing. Prairie dog burrows are 5–10 m (16–33 ft) long and 2–3 m (6.6–9.8 ft) below the ground. [20]
The Molossus were dogs that were kept by the ancient Greek tribe and kingdom of the Molossians, who inhabited the region of Epirus. [1] [2]The Molossus were famous throughout the ancient world for their size and ferocity and were frequently mentioned in ancient literature, including the writings of Aristophanes, [3] Aristotle, [4] Grattius, [5] Horace, [6] [7] Lucan, [8] Lucretius, [9] Martial ...
A dog trainer with the United States Navy, which primarily trains using positive reinforcement. [1] [2]Dog training is a kind of animal training, the application of behavior analysis which uses the environmental events of antecedents (trigger for a behavior) and consequences to modify the dog behavior, either for it to assist in specific activities or undertake particular tasks, or for it to ...