According to Wikipedia "Of the 3,637 species found worldwide,[2]some 35 species in 10 families are native to the British Isles." - So quite a few I imagine. I'd estimate a few million.
There are over 2,000 different species of woodlice
over 10,000
About 900 different spiecies of bats.
There are about 2000 different species of dinosaurs http://www.dinosaurfact.net
Not likely. Woodlice have many predators and so form the basis of a diet of many different animals.
recorded in 2006, there was 77 different bird spiecies that have been designated endangered under the ESA recorded in 2006, there was 77 different bird spiecies that have been designated endangered under the ESA
350
woodlice
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100 spiecies
Woodlice can survive many minutes underwater.