No. They are invertebrates
Redback spiders primarily feed on insects, such as ants, beetles, and flies. They use their venom to immobilize and digest their prey before consuming it. Additionally, redback spiders have been known to feed on other small spiders and even small vertebrates like lizards.
Two poisonous spiders found in Australia are the Redback spider (Latrodectus hasseltii) and the Funnel-web spider (Atrax and Hadronyche species). Both spiders can deliver a potentially dangerous venomous bite to humans.
a redback has no affect on the environment accept killing the environment
"Redback spiders can be difficult to remove because mere spraying of pesticides cannot kill redback spiders. Their hiding places have to be identified. Brisbane Pest Control Specialists from Bob Gunn can correctly identiywhere redback spiders are hiding because they know the insect's life cycle and habits." Source: Achive.org - Removing Redback Spiders From The Home
what are red back appearances
Redback, found in Australia
1. The Redback 2. The Funnel-Web 3. The Brazilian Wandering 4. The Brown Recluse 5. The Black Widow
Redback spiders in Australia like dark semi damp environments like in culverts, or under pot plants. But mostly dark tight places
yes they can be crossbred red back spiders
Redback spiders are a unique species that exist solely in Australia. If you need more information on them there are a number of websites available on Google.
The below list includes some of the most dangerous spiders to humans. 1) Brazilian Wandering Spider 2) Sydney Funnel Web Spider 3) Widow Spiders (including the Black and Brown Widows) 4) Sand Spiders (mainly, the Six Eyed Sand Spider) 5) Recluse Spiders (including the Brown Recluse) 6) Hobo Spiders 7) Redback Spiders 8) Mouse Spiders 9) Bird Spider (A type of Tarantula found in China)