We have two unusual cocoons around our house in central Florida. They are dark, spikey, and about 2 or 3 inches in length. What kind of critter can we expect to emerge from them?
You have a type of Bagworm, probably Thyridopteryx sphemeraeformis. This is a type of moth that often infests conifers like arborvitae. The caterpillars form the protective bag and never leaves it. It then pupates in the bag. The female is flightless and remains in the bag after emerging, and the male which has wings searches her out to mate.