What noise does a reindeer make?
A frequently asked question on the hill is what noises the reindeer make. Whilst they are mostly fairly quiet animals but there are a few fascinating reindeer noises.
For any of you who have been on the hill trip you will have heard the clicking noise coming from the back feet of the reindeer. Unlike the forest dwelling Roe deer, the reindeer do not have long enough legs to outrun their predators, instead they survive using safety in numbers. They are of course a herd animal. Whilst our reindeer no longer have any predators in the UK they have maintained the mechanism for staying together as a herd. The click is produced by the friction from a tendon slipping over a bone in their back feet. It happens with every single step that the reindeer take and cannot be switched off and on. The calves will have a very quiet click whereas the big bulls will have a quite a loud click, the noise of the whole herd moving is quite amazing. This means that even in the harshest of weather conditions, where they certainly wouldn’t want to open their eyes and wouldn’t be able to see through the blizzard if they did they can still hear where the rest of the herd are. If they were to grunt then opening their mouths would lose heat, the clicking doesn’t use energy or heat so is the perfect communication devise.
Another important reindeer noise is grunting. There are two times of year where the reindeer grunt, the first is the calving season in the spring where the cows will grunt to their calves if they are not close by. The second time of year where the reindeer grunt is during the breeding season, the rutting bulls will grunt to the cows. The reindeer grunt is a bit less majestic than the famous Red deer roaring in the glens or the Roe deer barking in the woods. If you want to read a bit more about the noises of all the native deer species, Tilly wrote a wonderful blog about it last year. https://cairngormreindeer.wordpress.com/2018/01/12/calling-all-deer/
I have saved the best reindeer noise till last, the reindeer yawn. When reindeer yawn they make a lovely creaking noise which is followed by a chin wiggle. Since I first started working with the reindeer I have been trying to record a reindeer yawning as I think it would be the best possible either alarm or text message tone. If anyone has managed to record this fantastic noise, please do get in touch! There seems to be much discussion over the purpose of a yawn. Popular opinion is that animals yawn to remind the rest of the group that they are tired and thus less alert for danger and this is why it is more common amongst social mammals. Recent research shows that the yawn may in fact be to cool down the brain, the long inhalation of air cools down the blood in the vessels close to the surface in the nose and mouth and the stretching of the jaw increases the blood flow to the brain. The blood then cools down the brain making it function better and the animal feel more alert. This would perhaps explain why the reindeer seem to yawn more than normal on a particularly hot day.