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A highly developed sense of smell kick-started the development of mammals' big brains. Scientists used very high-resolution scanning to study the skulls of two of the earliest known mammal species. Comparing the shape of their brain cases to those of slightly earlier animals, or "pre-mammals", revealed that the first brain areas to over-develop were those associated with the sense of smell...


 smell sense mammal evolution brain
Researchers have spotted a group of 53 cells within pigeons' brains that respond to the direction and strength of the Earth's magnetic field...


 pigeon bird navigation brain cell magnet field Earth neuron sense system:unfiled