>>28667441
Those can be pointlessly expensive if animals don't bother using them.
That much bridge (look how wide it is ffs) would be better used for human use elsewhere.
https://www.bbc.co.uk/news/uk-england-norfolk-51193389
It gets worse, pic rel was built for bats at a cost of £2m and bats don't use them. Why would they? Look at those things.