Eight legged Predators, Spiders cannot completely digest solid food stuffs, instead they inject fluid into the substance and suck the melted substances, which is one of the Amazing facts about animals.
Unlike human, Spider’s doesn’t have blood, but they have “Hemolymph“, which is similar to “Haemoglobin” in human blood.
These spiders have open circulatory system, that contains no arteries, veins or blood vessels and the entire body is filled up with fluid, which is completely different from human beings.
Haemoglobin is composed of Iron, while Hemolymph of spider is copper based. When this Hemolymph reacts with oxygen in air, the color turns “Blue“.
But, human blood is red because of the presence of Haemoglobin, which is composed of iron.
Spiders which live in water, respirates through the air bubbles stuck into their web.
When their web becomes dirt or no longer sticky, theses spiders eat those webs and uses its nutrients to make new web. These spiders are called “Diving Bell“.
Antartica has no spiders, as the extremely cold temperature restricts its survival.
One of the species of spider has been categorized as “Vegetarian“, that eats only buds of acacia plants and occasionally ant larvae. These spiders are called “Bagheera kiplingi” discovered in 1800’s.