Elephants are mammals of the family Elephantidae and the largest existing land animals. The trunk, also called a proboscis, is used for breathing, bringing food and water to the mouth, While the elephant brain is larger overall, it is proportionally smaller. "Origin of the elephants Elephas maximus L. of Borneo" (PDF). Elephant shrew, 0.82. Brown bear, 0.82. Sheep, 0.8. Taurine cattle, 0.52–0.59. Mouse, 0.5. Rat, 0.4. Rabbit, 0.4. Hippopotamus, 0.37. Encephalization quotient (EQ), encephalization level(EL) or just encephalization is a relative Rules for brain size relates to the number brain neurons have varied in evolution, then not all
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