This is the hazelnut tree I sometimes use as a bike rack, and wrote about back in February, discussing the male and female catkins. I remarked that I should keep an eye on the small, female catkins, to watch for the nuts to develop. And then I forgot all about them.
Until yesterday, when as I walked past the tree, the ground crunched underfoot. Nuts! A squirrel was working through the branches above, nipping off and dropping the hazelnut clusters. As I covered in the February post, although pollination occurred back then, fertilization did not occur until recently (in June). In these past few weeks the nuts have developed quickly.