I now know springtails are shorter than a - (dash) and i am guessing they are bugs.. (or are they fish ? or repiles? )

strange creatures take up habitat in caves.. and i am a city gal.. there are some rocks ovehangs that offer shelter (one in inwood park (north manhattan) was refered to in 'last of the mohicans', and is still unchanged) but no natural caves. (and the animals that populate the un-natual caverns aren't nice or interesting ones!)

before you go on, what is a springtail?