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The ear's shape also allows the sound to be heard more accurately. Many breeds often have upright and curved ears, which direct and amplify sounds. As dogs hear higher frequency sounds than humans, they have a different acoustic perception of the world. [24] Sounds that seem loud to humans often emit high-frequency tones that can scare away dogs.
[4] These dogs are variously known as a Florida Cur, Florida Cow Dog, Florida/Cracker Cur and/or Florida Cracker dog. [5] Originating from Florida, this rugged and courageous cattle herder has been serving as a defense against wild cats, boars, and bears since the early days of cattle ranching in the region.
The Vacanti mouse. The Vacanti mouse was a laboratory mouse (circa 1996) [1] that had what looked like a human ear grown on its back. The "ear" was actually an ear-shaped cartilage structure grown by seeding cow cartilage cells into biodegradable ear-shaped mold and then implanted under the skin of the mouse, with an external ear-shaped splint to maintain the desired shape.
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The house mouse is best identified by the sharp notch in its upper front teeth. House mice have an adult body length (nose to base of tail) of 7.5–10 centimetres (3–4 in) and a tail length of 5–10 cm (2–4 in). The weight is typically 11–30 g (3 ⁄ 8 –1 oz).
After refining the techniques and building on the work of Robert Langer at MIT, in 1997 Vacanti and colleagues at the University of Massachusetts controversially and with much media attention grew a cartilage structure resembling a human ear on the back of a nude mouse - dubbed the Earmouse, [11] Auriculosaurus [1] or Vacanti mouse - using a ...