"Three-spined sticklebacks are the classic “tiddler” of British waters and many other areas in the northern hemisphere. There are populations in marine and freshwater with some migrating between the two. They can actually sport two to four spines on their backs, with three being the average. These sharp spines and large bony side plates provide essential armour against an array of fish and bird predators.
"The stickleback male is a fantastic father. After attracting an egg-laying female to a nest with a zig-zag courtship dance and bright red colourings, he fans the fertilised eggs with his fins to provide oxygen. Once the eggs have hatched he protects the small fry and teaches them self-defence from predators by chasing them."