ELI5
There was a couple of instances where a spider stopped in his track as soon as he notices me while an ant acts like I’m nothing else than an obstacle that can be climbed on.
Also, the bigger the spider is, the more cautious seems to be around people.
Is this a sign of various degrees of intelligence on insects or is it their natural predator nature that makes spiders to be more aware of their surroundings?
I’ve seen spiders stand still when I’m looking at them and start moving once my back is turned. I imagine they can see my eyes and recognise what they are for.
In: Biology
Spiders have incredible senses, vision is one of them. Beyond that though is the “spider sense” that Spiderman’s was based off of, their sense of touch. If a spider was large enough that it could reach up and touch space (62Miles/100km) then it would still be able to feel you walk up and brush a feather against it. Some might be able to feel Brownian motion, the jiggling of atoms and molecules. Hearing factors into this too, I’m not sure if they can hear like we can but they are very sensitive to vibrations through their sense of touch. Some are also able to fly using the earths magnetic field, spiders are incredible, thank God they aren’t the size of dogs or something.
Spiders are highly evolved and specialized, they are masters of survival while individual ants are not. Ants strength comes from their numbers and how they tend to act as one, almost like a hive mind, and since only the collective is important each member doesn’t need to be highly evolved to survive.
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