In the city centre of Amsterdam, a seemingly ordinary bird nest tells an extraordinary story of human impact on the environment. It's constructed from unexpected materials, including sunglasses ...

Nearby were bamboo fungi with graceful tutu-style caps and minuscule bird's nest fungi. A chef thinks of turning mushrooms into delicious dishes. Scientists like Tang have loftier goals.

There’s something for everyone to look out for, some easy ones for beginners or harder ones for seasoned naturalists: from flocks of migrating geese to fungi that look like tiny bird's nests!