Infrared vision questions

I’m working with Random_dragon on the MShock32Modded tileset. I made this nice infrared graphic seen below, but I need some expert input.

The graphic I’m talking about is the orange blob out in the darkness. For reference my character (in the rain coat) has the night vision trait, activated his infrared vision bionic, and it’s raining at night. Those other monsters are a shocker Z. and a corrosive Z. In ASCII you would see red question marks. I think this orange blob would work well for zombies and people, but I’m worried about what other things may be visible. It wont be appropriate for rabbits or generators. So, what all is visible with infrared?

Also, the object ID is “unknown.” Is heat vision the only usage of the “unknown” object?