Snow lies still, but the soundscape beneath it is full of clues. A fox’s tall, forward-facing ears act like paired antennas, capturing faint rustles from a mouse tunneling below. The key is not volume; it is timing. Sound reaches one ear a few milliseconds earlier than the other, and the brain reads that delay as direction.Neuroscientists call this gap an interaural time difference, or ITD. In the...More