Spider Eggs are acquired by destroying a Tier 3 Spider Den or killing a Spider Queen. They can be planted on the ground by picking them up from the inventory and clicking the ground with the right mouse button. This will create a tier 1 Spider Den, which then grows normally.
Spider Eggs can be used to create Spider Dens at any specific place, often an area where one can safely contain the Spiders for Silk farming. Spider Eggs are also a great fuel for Campfires, adding a lot of burn time.
When removing/inserting Spider Eggs from/into one's inventory, the item makes a squelching noise. In addition, when selected from the inventory, the eggs will make a "Babum" sound.
Despite what Wilson says after inspecting Spider Eggs, they will never hatch unless the player manually plants them.
Attention: The following categories are only for the players look up the page based on their first impression, they have nothing to do with the actual categories/behavior/function/tags of these items