How do penguins tell the direction?

When the weather is bad and the sun and stars can't be seen, some people use pigeons to do experiments, tie batteries and coils to pigeons, and produce artificial magnetic fields. It is found that artificial magnetic fields will interfere with pigeons' ability to go home, which proves that birds can feel the magnetic field of the earth and identify their flight routes by it.

Some people put penguins in caves hundreds of kilometers away from their hometown and put covers on them.

There is a Ma Pingchuan without any signs or features. Then they observed where the penguins were placed on observation towers in three different positions. After a while, the penguin came out of the hole.

At first, the penguins wandered around at a loss for a while, and then turned their heads to their hometown.

After many observations, scientists have determined that the penguin's ability to know the way is related to the sun and has nothing to do with the surrounding environment. The compass in their bodies is oriented towards the sun.

Others have done experiments. They put birds in the planetarium and broadcast the night sky. When the Nordic autumn constellation appears in the sky, the bird turns its head to the southeast; When a constellation appears in the sky of the Balkans, the birds turn to the south; When the night sky in North Africa appears, birds will fly due south. Migratory birds seem to know their direction by the stars when they fly at night.

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