Search results
Results from the WOW.Com Content Network
Most spiders' eyes can detect little more than brightness and motion, so vision plays only a minor role in behaviour. However some species, such as jumping spiders, wolf spiders, and deinopids, have more developed eyes which they use in hunting and courtship. [2]
Spiders do not have compound eyes, but instead have several pairs of simple eyes with each pair adapted for a specific task or tasks. The principal and secondary eyes in spiders are arranged in four, or occasionally fewer, pairs. Only the principal eyes have moveable retinas. The secondary eyes have a reflector at the back of the eyes.
Spiders also have several adaptations that distinguish them from other arachnids. All spiders are capable of producing silk of various types, which many species use to build webs to ensnare prey. Most spiders possess venom, which is injected into prey (or defensively, when the spider feels threatened) through the fangs of the chelicerae. Male ...
Forest Spiders of South East Asia: With a Revision of the Sac and Ground Spiders. Brill Publishers. ISBN 978-9004119598. Eaton, Eric R.; Kaufman, Kenn (2007). Kaufman Field Guide to Insects of North America. Houghton Mifflin Harcourt. ISBN 978-0618153107. Filmer, Martin R. (1991). Southern African Spiders: An Identification Guide. Random House.
In web-building spiders, all these mechanical and chemical sensors are more important than the eyes, while the eyes are most important to spiders that hunt actively. [ 13 ] Like most arthropods, spiders lack balance and acceleration sensors and rely on their eyes to tell them which way is up.
Many traditions regard spiders as auspicious signs of good fortune and luck, especially when it comes to new ventures or creative pursuits. "The moon is always connected to the Goddess, therefore ...
Spiders and spiderwebs are also very common this time of year since the baby spiders have grown up and are more visible, and many spiders are out and about more, moving around to look for mates.
The estimations are based on research into how many spiders live on a square meter of land for all main habitat types of earth, and the average amount of food consumed by spiders of different ...