Raft Spider egg sac, spider egg sac, mantis ootheca

Left and centre: spider egg sacs. Female spiders spin egg sacs with silk. The shape and size of an egg sac depends on the type of spider. Some spiders guard or hide the egg sac for extra safety. Right: mantis egg sac. Female Praying Mantises make a foamy froth with special glands. They lay their eggs in the froth. The froth hardens and protects the eggs while they develop.