system
Given the following post, respond as if you're commenting on Reddit:
human
Are sensory organs like eyes, ears, nose etc. in all or almost all animals close to the brain?

I have wondered because in all animals I can think of, these organs are as close as possible to the brain. The most obvious reason seems to be that this way the sensory input reaches the brain a few milliseconds faster, but I somehow find it hard to believe that the evolutionary pressure has been so high for all animals that those with diverging organs had no way to reproduce in large enough quantities.
gpt
The concept of most sensory organs located directly near the brain is mostly vertebrate-centric. Arthropods can diverge from this rule in their extreme diversity, as there are several groups that evolved accessory organs related to functions specifically needed for tasks in their group.


A few examples:

* Crickets and grasshoppers being one of the few with a communication system through sound, developed ears on their legs.

* Butterflys and moths appear to have ear-like structures at the base of their wings, with their wing veins directing sounds towards it. Very useful for detecting predators.

* For another butterfly example, some species are able to taste with their legs. This is to find the right host plant for egg deposition.

* Spiders have several families with very poor eyesight, which effectively have turned vibration sensing in their extremities into a substitute for ears and eyes.