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Fascinating numbers

Fascinating numbers - Did you know?

They are fascinating animals of the night, shrouded in history, worshipped by some as 'cute', and loathed by others as 'creepy': bats. In the Swiss canton of Graubünden 25 types of bat have been documented to date. 

In the fine part of the year, these small mammals spend their days in cracks in buildings, in attics, holes that woodpeckers have made and hollow trunks – and also in some of the station buildings of RhB. For example, in 2015 traces of droppings of common pipistrelles were found in the station building in Bergün. Pipistrelles were also found in suspended ceilings in the station buildings in Disentis, St. Peter and Schnaus. The common pipistrelle is one of the smallest species of the mammal with a wingspan of up to just 25 centimetres. When their wings are folded, they are only about the size of a matchbox. They can grow to a body length of 4.5 centimetres and weigh between 3.5 and 7 grams – or in other words not much more than one cube of sugar. Most types of bat only have 1 baby a year. The animals compensate for this low birth rate, however, with their long life expectancy: bats can live to be 20 or 30 years old. The orientation call of the common pipistrelle is at its loudest at 43 to 45 kilohertz. In the case of the lesser horseshoe bat, the volume is 106 to 116 kilohertz. Human adults normally only perceive frequencies between 16 hertz and 18 kilohertz.