The Eurasian water shrew is an insectivorous rodent that grows to around only 15cm long! Despite its unimpressive size, it has venomous saliva which it uses to temporarily paralyse prey, such as river fly larvae, which it catches by acrobatically diving to river beds. Due to their small size, water shrews have a high metabolism and must consume about half of their own body weight in insects a day or risk starvation!
Part of my project with the Ecologist at Bedfont Lakes is to investigate whether these tiny mammals are present along the river banks of some of Hounslow Boroughs nature reserves.