Natural selection has apparently kept those repetitive sequences intact over the 120 million years since the orb weavers diverged into different species, which suggests the sequences are important.
22.
The older the female golden orb weavers are, the sloppier their webs, said Larry Harjehausen, a volunteer guide at John D . MacArthur Beach State Park.
23.
Most research has focused on the " dragline " silk that orb weaver spiders use for the main structure of their webs and for lowering and raising themselves.
24.
Nexia uses two common spider specimens, Araneus diadematus ( the common garden spider ) and Nephila clavipes ( the golden orb weaver, native to many tropical forests ).
25.
Black and yellow mud daubers primarily prey on relatively small, colorful spiders, such as crab spiders ( and related groups ), orb weavers and some jumping spiders.
26.
A "'trap line "'is used by some orb weaver spiders as a mechanism to alert them of a newly captured prey in their web.
27.
Males in species of the golden orb weaver, for instance, can protect their paternity by obstructing the female's genital openings with fragments of their copulatory organs.
28.
Orb weavers of one species sometimes invade the web of another, and staying on the radii, feed on prey the resident spider has wrapped up and immobilized with its venom.
29.
A : You're seeing what are commonly referred to as orb weaver spiders, which are neither poisonous nor dangerous, said Beverly Sparks, University of Georgia Extension Service entomologist.
30.
That, they say, indicates that the basic silk recipe dates back to the earliest orb weavers that evolved 125 million years ago and suggests that this recipe leaves little to be improved upon.
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