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There are at least two kinds of Spiders that get called "red backed" spiders.
One Redback spider, found in Australia, is a member of the same genus as our Black Widow spiders. They are definitely dangerous as are all the widow spiders. They have a glossy black abdomen with a variable width bright red band along the top. Worldwide, widow spiders kill more humans per year than any other species. The are relatively small spiders so they do not have as much venom available as do some larger spiders. Their venom travels rapidly through the human body, so the bigger the human the more diluted is the venom dose. That means that children are the most likely to be killed. Adults rarely if ever die unless they are in poor health to begin with. The widow spiders like to make their tangled webs in places like overturned wooden boxes in back yards and underneath the seats of outdoor toilets.
The Redback spiders may get confused with a very different kind of spider, a large jumping spider whose abdomen as seen from the top is predominantly red with a black stripe. Its scientific name is Phiddipus johnsoni. Jumping spiders walk around on bushes and walls and jump on their prey to capture it. The males of this species have less black and brighter red coloration as compared to the females. These spiders at adulthood are typically around 3/4 of an inch in body length, so they have a lot of venom available (at least compared to most jumping spiders). However, their venom is similar to other members of this genus and does not pose a threat to human life. Probably because of the larger volume of venom involved, some people have experienced considerable discomfort when they have been bitten.
Jumping spiders have excellent vision, and they are all well capable of noticing an approaching human. Some jumping spiders are very shy and will immediately seek a less exposed position. Other jumping spiders are less shy and will turn around so that they can observe the approaching human. Some are so curious that they are hard to photograph because they will jump on the camera lens to explore it, or they may jump onto a human's hand if they are not given special cause to fear it. They do not jump onto such a large object with the intention of biting. The Redbacked Jumping Spider is unusual in that it is almost totally fearless. Unless the surface they rest on is jolted somehow, they will generally not move away. The problem is that if a human takes advantage of the situation and captures the spider then the spider may get pinched or squeezed in the process, and when a spider gets hurt it may bite to protect itself. It is also possible that humans are more likely to unintentionally brush against these spiders because they are not so quick to run away as are other jumping spiders. Perhaps some children find these beautiful spiders so attractive that they attempt to capture them and take them home. If they are bitten, the pain will be at least as painful as the sting of a honey bee, and a relatively large dose of venom may be injected due to the large size of these members of the genus Phidippus. So the experience will not be pleasant, but not life threatening. The effects will gradually decrease in intensity over the course of a few days.
There are a few other kinds of spiders that are prodominantly red, but they are small and not known to bite humans.
What else can I help you with?
What kind of black spider has a white crescent on its back?
The spider you are referring to is likely the black widow spider. The female black widow has a distinct red hourglass shape or white crescent on its abdomen. They are known for their venomous bite, so caution should be taken when encountering them.
Does the black widow have a violin shape on its back?
No. The black widow is a shiny black with a bright red hour glass shape on its back.
What black spider has a red back and thick fuzzy legs legs?
A black spider with a red back and thick fuzzy legs is commonly called a jumping spider. The formal name is Phiddipus audax.
What kind of spider is black with red x on belly?
Some species of black widow have a red dot. A redback spider, the equivalent of a black widow in Australia, also has a red dot on its back. It is all black and quite small and has a big red patch on its back. it is highly venomous. See the related link below for a picture.
You found a black spider in your backyard with a red mark on its back a green fangs what kind is it?
It sounds like you may have found a black widow spider. Black widows are known for their shiny black bodies with a red hourglass mark on their underside. Their fangs are typically a shiny green color. Be cautious around them, as their bite can be venomous.
Is the black spider with an orange dot on its back poisonous?
Yes, the black spider with an orange dot on its back is likely a black widow spider, which is venomous.
What is the name for an Australian spider beginning with r?
Redback Spider is indigenous to Australia. It is a venomous spider.
What kind of black spider has a white crescent on its back?
The spider you are referring to is likely the black widow spider. The female black widow has a distinct red hourglass shape or white crescent on its abdomen. They are known for their venomous bite, so caution should be taken when encountering them.
Does the black widow have a violin shape on its back?
No. The black widow is a shiny black with a bright red hour glass shape on its back.
What black spider has a red back and thick fuzzy legs legs?
A black spider with a red back and thick fuzzy legs is commonly called a jumping spider. The formal name is Phiddipus audax.
What kind of spider is black with red x on belly?
Some species of black widow have a red dot. A redback spider, the equivalent of a black widow in Australia, also has a red dot on its back. It is all black and quite small and has a big red patch on its back. it is highly venomous. See the related link below for a picture.
What kind of spider has a black line on its back?
The spider with a black line on its back is commonly known as the black widow spider.
What is on the back of a black widow spider?
The American Black Widow should have nothing upon its back but the black color it is. Specfically, the hour glass is on the belly of the spider.
You found a black spider in your backyard with a red mark on its back a green fangs what kind is it?
It sounds like you may have found a black widow spider. Black widows are known for their shiny black bodies with a red hourglass mark on their underside. Their fangs are typically a shiny green color. Be cautious around them, as their bite can be venomous.
Black spider with hour glass on back?
black widow
What kind of spider is brown with green reflective spots on back?
An Arrowhead spider is brown with a green back. This spider is also known as a Triangle Orb Weaver. This spider is not venomous.
What spider is brown with a black spot on its belly?
Possibly a Black Widow. Be careful.The Redback spider (Latrodectus hasselti) fits this description. It is a venomous spider found in Australia, and common around the house. See the related link for a photo and more information. It is a member of the Black widow family.
