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A hypocycloid that forms a self-crossing hedgehog. In differential geometry, a hedgehog or plane hedgehog is a type of plane curve, the envelope of a family of lines determined by a support function. More intuitively, sufficiently well-behaved hedgehogs are plane curves with one tangent line in each oriented direction.
A hedgehog is a spiny mammal of the subfamily Erinaceinae, in the eulipotyphlan family Erinaceidae. There are 17 species of hedgehog in five genera found throughout parts of Europe, Asia, and Africa, and in New Zealand by introduction. There are no hedgehogs native to Australia and no living species native to the Americas.
Desert hedgehog from Eastern Saudi Arabia. The desert hedgehog is one of the smallest of hedgehogs. It is 5.5 to 11 inches (140 to 280 mm) long and weighs about 10 to 18 ounces (280 to 510 g). The quills (or spines to give their correct name) on its back can be banded with coloring similar to the four-toed hedgehog. It is usually identified by ...
Czech hedgehogs are made from two metal beams that are sealed together at angles. A third beam is added to allow the hedgehog to keep its shape and to function even when moved or tipped over. Any ...
The Hedgehog signaling pathway is a signaling pathway that transmits information to embryonic cells required for proper cell differentiation. Different parts of the embryo have different concentrations of hedgehog signaling proteins.
The Southern African hedgehog is said to be a slow mover; however, when threatened, it can move surprisingly fast at 6 to 7 km/h (3.7 to 4.3 mph). [3] During the day, they typically stay where they live, which is an area that is covered with vegetation or in a hole in the ground.