Even though snakes have noses, they smell odors of their prey, mate or surroundings with the help of their tongue and vomeronasal organ. Each time a snake flicks its tongue in air, it collects odor particles. Then, when the tongue is brought back, the particles are transferred to the vomeronasal organ. This organ detects the odors and sends signals to the brain, helping the snake smell.
Now, we know that when we see with our two separate eyes, our brain combines the two different perspectives and makes a detailed image of our surrounding. Similarly, because the tongue of a snake is forked, it collects odor particles from two different locations, helping the snake understand in which direction the odor is coming from and thus, making it easier to locate the prey.
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