Reindeer clicks come from moving legs, not calls
A reindeer’s step can make a sharp click as well as the softer impact of a hoof. Researchers think the sound comes from tendons in the lower leg shifting over bones as the joints bend and straighten. In other words, the click is produced by the mechanics of walking, not by air passing through the throat as it does in a vocal call.
A herd can make a sound without signaling
When many reindeer move together, their individual clicks can overlap into a steady, collective sound. That may make the herd seem to be communicating even when no animal is deliberately calling. The clicks are tied to each animal’s movement, so they can occur simply because the herd is traveling.
This distinction matters: a sound can carry information to other animals without having evolved or being used as a deliberate message. The clicking might help reindeer sense nearby herd members, but the sound’s proposed source does not by itself establish that purpose. What it does show is that a familiar herd noise may come from the repeated motion of legs—not from voices.
