system
Given the following post, respond as if you're commenting on Reddit:
human
What does the term "cold blooded" in cold blooded actually mean? Could someone elaborate please?

Do they need to warm up their blood? How do they survive in hot or cold environments? What fundamental things do they differ in from warm blooded animals?
gpt
It means they are ectothermic, and internal sources of heat are typically small and inconstant. They typically use environmental heat sources, and do not have a maintained body temperature. Some ectotherms can raise their temperature internally if they need to. Others just find a nice rock and bask in the sun.

They do need to warm up before activity. Bees vibrate their flight muscles to get them up to temperature, for example.

On a biochemical level, their enzymes must work across a large temperature range, making them more inefficient than enzymes which work only at a very narrow range.

It's also wrong to just say they're "cold blooded" or "at the environmental temperature", it's more accurate to say that their temperature can vary by large amounts.