This Dutch video is about wildlife in Amsterdam city.
In 2013, volunteers have counted plants, growing on walls near the canals of Amsterdam in the Netherlands.
They found ten rare protected species: brittle bladderfern, yellow corydalis, green spleenwort, pellitory of the wall, wallflower, rustyback, maidenhair spleenwort, fern-grass, hart’s-tongue fern and black spleenwort.
Especially for maidenhair spleenwort, things go well. There are now 8,000 plants, twice as many as the 2007 number.
In 2013, the royal fern grew again in Amsterdam, after an absence of 26 years.
A map of where the plants grow is here.