Female Juro spiders are bright yellow and black, growing up to 4 inches and and spinning webs up to 10 feet wide. Giant flying spider species lands in Pa.: What to know about the Joro - pennlive.com ...

While roughly 3,000 species of spiders are found throughout the U.S., very few pose a direct threat to humans. Spider bites are rare, and medically significant incidents are even less common ...

Though rare in Pennsylvania, black widow spiders offer bites that are medically significant for humans. JasonOndreicka Getty Images/iStockphoto While roughly 3,000 species of spiders are found ...

These species are also known as Trichonephila clavata. Measuring around 3-4 inches, female Joro spiders are larger than the males, and are primarily yellow with dark blue strips and a reddish abdomen.