It is a very common mistake to look at a spider crawling on the wall and call it an 'insect' or a 'bug'. In biology, spiders belong to an entirely different class of animals, and their leg count proves it.
Spider Legs: Exactly 8 legs.
Insect Legs: Exactly 6 legs.
Biological Class: Spiders belong to the class 'Arachnida', not 'Insecta'.
Every spider in the world has exactly 8 legs (four pairs).
If you see a tiny creature crawling in your house and you want to know what it is, just count the legs. If it has 8 legs, it is definitely a spider.
This is a basic classification rule in Biology:
Therefore, because a spider has 8 legs, it cannot be classified as an insect.
A spider has exactly 8 legs (four pairs). Because of this, spiders are classified as Arachnids and not as Insects (which only have 6 legs).
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