NO...they are not real! Heh...just decorations. If you want to make your halloween decor really scary with some creepy crawlies, why not create your own pet spider? I've done this already with my daughter and she loved it!
Try wrapping some cotton or fake spider we around a mason jar and then gluing your spider to the outside.
In this picture, someone has used the squishy bath sponges inside mason and empty candle jars, then added the spiders. The mason jar on the left side looks as if a huge toy spider has been hot glued to the inside!
For a really creepy look, pour some dishwashing liquid or laundry detergent (clear, green, or orange) into a mason jar/glass and then place the spider to float there.
For a more realistic and simple look, take your fake toy spider and place it inside some cookware that has a lid...looks just like you've captured a spider!