Homing pigeons may be using infrasound, very low frequency sound, to help them navigate. They can't successfully use their magnetic compass in the absence of light. The theory is that where the pigeons live, they listen to the infrasound in that location. It has a very, very particular quality, like a note of a bell or something.
As part of a massive new global tracking project, scientists are monitoring animals from a receiver on the International Space Station, mapping the incredible, previously unknown journeys that animals undertake. They’re beginning to tackle questions like how far do animals actually move? And how in the world do they know where they’re going?
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