Hundreds of thousands of a kind of bug you've probably never heard of, in Needham

Jef Taylor and a friend were walking through Ridge Hill Reservation in Needham when Taylor looked down and saw a few insect-like springtails:

I stopped because I noticed some, then I noticed more, then I noticed that the leaf litter surrounding the boardwalk was covered with hundreds of thousands of them. ... There were so many of them that when we stopped hiking to take these pictures, we could hear them jumping on the leaves, like the fall of raindrops.

Yes, there are pictures. Closeups, even.