The invasive Joro spider has been spotted in Pennsylvania as it continues to spread in the U.S. ... will lay egg sacs holding 400 to 500 eggs. The spread of Joro spiders — where are they headed?

A female can live up to a year or more and produce several egg sacs containing up to 800 eggs, which hatch in about a week. ... Other notable spiders in Pennsylvania. Of course, ...

The invasive Joro spider has been spotted in Pennsylvania as it continues to spread in the U.S. ... will lay egg sacs holding 400 to 500 eggs. The spread of Joro spiders — where are they headed?

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 ...

The invasive Joro spider has been spotted in Pennsylvania as it continues to spread in the U.S. The giant species was first seen in Georgia a decade ago.