Move desks and supplies from one corner of the classroom. Clear the area entirely to build the pretend cave.
Surround the area with a variety of large boxes to construct the walls of the cave. Secure the boxes to each other with packing tape, to avoid unexpected cave collapses. Drape dark sheets over the boxes, including over the top of the cave, to create a ceiling. Be sure to leave an entry way for children to enter the cave.
Tile white Christmas lights throughout the top of the cave in case you need lights inside of the cave. Attach to an extension cord that can be plugged in whenever the lights are needed.
Fill paper bags with balls of newspaper. Staple the top of the paper bags to hold the paper in. Round the bag with your hands to resemble rocks. Scatter throughout the cave.
Place stuffed bears and bats inside of the cave. Hang bats from the ceiling with string to demonstrate the habitat.