system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do black widow spiders have such strong venom, when they only eat insects?
gpt
In nature, it's often advantageous for predators to minimize the time it takes to kill their prey so as to minimize harm, i.e. the longer the prey is allowed to struggle and fight back, the greater the possibility of injury to the predator. Therefore, many predators develop stronger and stronger venom.