I normally have many monarchs in all stages so this method of hatching and habitat has worked well. Eggs are hatched in plastic snap lid storage containers about 18"x12"x4". Spread a single Viva paper towel (doesn't mold) in the bottom of container. Using a spray bottle, mist the paper towel to slightly dampen. Place leaves with eggs in the container on towel in single layer. Cover with lid and keep out of direct sun. My screened in porch works well for the whole process. With lid on, the leaves should stay hydrated until the caterpillars hatch. As the cats are so small, I find it easiest to use scissors to trim away most of the leaf and then place the tiny cat & leaf portion on a fresh leaf. At this point, I change the habitat with fresh paper damp towel and leaves everyday. When they grow to about 2nd instar, they are transferred to a glass container. Glass cube vases or glass terrariums from the craft store work well. Place a damp paper towel in the bottom and insert about 1 leaf per cat. Don't crowd - about 3 per 6" vase. Insert a small stick for climbing. Cut a piece of netting to cover top and secure with rubber band. Hint: I find it easier to cut around the cat on the old leaf and then place on fresh leaf. Empty out old bedding everyday and give fresh leaves everyday. Cats usually attach to the netting. If I have a very large population, I transfer the chrysalis attached to the netting to an obelisk to hatch. A very careful dab of hot glue attaches the netting with chrysalis to the frame. I have had over 100 in chrysalides & cats at one time, so freeing up habitat space was a necessity. Housing the whole leaf with egg attached on top of the damp paper towel in covered container has greatly improved the hatching success. It also takes up very little space as plastic containers can be stacked. All habitats are rinsed with 10 to 1 water/bleach to disinfect when empty before staring new group.