Canis Major (Latin for greater dog) was the largest of Orion's hunting dogs (Laepaps).
According to ancient Greek, Canis Major ran incredibly fast, and won a race against a fox that was the fastest creature in the world. (They obviously had not seen a cheetah yet)
Because of this Zeus placed the dog in the sky to commemorate the victory.
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The constellation Leo contains the fastest animal, which is the star Regulus. Regulus is located in the heart of the lion and is considered to be one of the brightest stars in the night sky.
The peregrine falcon is the fastest animal in the air, reaching speeds of over 240 mph.
The pronghorn is the fastest hoofed animal, capable of reaching speeds up to 55 mph (88 km/h) over short distances.
The ostrich is the fastest animal in the Sahara Desert. The ostrich can run at speeds of 40-45 miles per hour and is the third fastest land animal in the world behind the cheetah and the pronghorn.
The cheetah is the fastest land animal on Earth, capable of reaching speeds up to 70 mph in short bursts.
The peregrine falcon is the second fastest animal in the world, reaching speeds of up to 240 mph while diving.