not very big................................craig is right
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little brains
yes they have very big brains
All things are relative. Compared to an earthworm, turtles have big brains. Compared to a dog, turtles have small brains.
brains, watermelons
this big [ ]
It's called an exoskeleton. Spiders are invertibrates which mean without an internal skeleton.
Adult Wolf Spiders are about as big as your middle finger and your thumb curved to make a ring. I have wolf spiders in my home and i have a phobia of spiders, especially the big spiders. they are as tall as about an inch, or maybe half an inch. The "not fully grown" spiders are much faster than adult wolf spiders. These kinds of spiders are harmless, as well as 97.8% of all spiders in America.
Camel spiders do not grow as big as most people think, the exaggeration in their size is an urban legend. Camel spiders only grow to about six inches big.
Very big
Because 30% are big so the answer it's big and 70% are small and is not difference between insects and spiders
Arachnophobia <applies to all spiders big/small>
brains