Tarantula |Amazing Egg Sac Opening | Eggs with Legs | Sling | Spiders.2

Описание: #Tarantula#Eggsac#Spider

The protective egg sac surrounding the eggs of most spiders is made of silk. Although a few spiders tie their eggs together with several strands of silk, most construct elaborate sacs of numerous layers of thick silk. Eggs, which often have the appearance of a drop of fluid, are deposited on a silk pad and then wrapped and covered so that the finished egg sac is spherical or disk-shaped. The females of many species place the egg sac on a stalk, attach it to a stone, or cover it with smooth silk before abandoning it. Other females guard their egg sacs or carry them either in their jaws or attached to the spinnerets. The European cobweb spider (Achaearanea saxatile) constructs a silken thimble-shaped structure and will move the egg sac into or out of this structure to regulate egg temperature. Female wolf spiders carry their egg sacs attached to the spinnerets and instinctively bite the egg sac to permit the young to emerge after a certain length of time has elapsed. If a female loses an egg sac, she will make searching movements and pick up a pebble or paper and attach it to the spinnerets.

Maturation
The young of most species are independent when they emerge from the egg sac. After hatching, wolf spiderlings, usually numbering 20 to 100, climb onto their mother's back and remain there about 10 days before dispersing. If they fall off, they climb back up again, seeking contact with bristlelike structures (setae). Some female spiders feed their young. When food has been sufficiently liquefied by the female (in spiders, digestion occurs outside the mouth), the young also feed on their mother’s prey. The female of some spiders, including one European species (Coelotes Terrestris), dies when the young are ready to feed, and they eat her carcass. The mother of one web spider (Achaearanea Riparia) plucks threads of the web to call her young, both to guide them to food sources and to warn them of danger.

Source:
https://www.britannica.com/animal/spi...