I believe it is a type of jeweled spider.
Your mom.
6,000 on its butt.
The spider you are describing is likely the black widow spider. It is known for its shiny black body with a red hourglass-shaped marking on its abdomen. This spider is venomous and can be found in various parts of the world.
They have a spike to protect them self from predators.
The distinguishing feature of a black spider with a brown butt is its unique coloration, which sets it apart from other spiders that may have different color patterns or markings.
Don't mind if I do. (Yum.)
I think its a white tail :D
a redback spider
The male green jumping spider has a dark red head and a bright green body. The scientific name for this spider is Mopsus Mormon.
If its black, has a large butt and there's a red shape on its back the resembles an hourglass, then its a black widow spider and they are very poisonous
This is probably a Red-Backed Jumping Spider. The male has a black body with a bright red abdomen. The female is the same, but the red abdomen has a black stripe. They're found all over the United States. If you want pictures of them, you can find them online at http://kaweahoaks.com/html/spi_phidippus_johnsoni.html.
The spider with a big white butt is likely a species of orb-weaver spider, known for their distinctive white or light-colored abdomens.