The Scottish Salmon, known as the ‘King of the Fish’,can get to be very large fish, growing over a metre in length. They are found in the cleanest rivers and spend most of their lives at sea, famously returning to spawn in the same stretch of river or stream in which they hatched. They are able to clear seemingly insurmountable obstacles during the journey to spawn: from waterfalls to weirs and have been known to leap vertical obstacles over 3 metres tall. It is unclear how they navigate to the breeding grounds of their own birth but it is thought smell is important in freshwater and the Earth’s magnetic field plays a part when they are at sea.