system
Given the following post, respond as if you're commenting on Reddit:
human
How do mosquitoes know where a human is at night? Do they have thermal sensors?
gpt
Mosquitoes (females which are the ones that suck your blood) are attracted to your breath (CO2 being exhaled). If you are big you expel more CO2 making you are a bigger target. They also smell your sweat and lactic acid, especially if you've been active.