system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how do we know how well other animals can see or smell?
gpt
Two main ways: 

1. Dissecting animals sensory organs to analyze their structure (For example, we can look at the structure of rods and cones in their eyes and theorize based on that).
2. Running tests like playing high or low pitched sounds, putting them in mazes with food, etc.