system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is that animals can sense things like earthquake before they happen while were left totally clueless?
gpt
Earthquakes produce two kinds of waves, P-waves and S-waves.  P-waves travel faster through the ground than S-waves, and aren't destructive, or even easily noticed by humans.

The leading theory is that some animals can sense the minor vibrations caused by the P-waves, which alert them to the incoming S-waves (which are what cause the damage from the earthquake).

As a side note, we have the capability to build P-wave detectors which can give warnings as early as 60-90 seconds before an earthquake hits, depending on how far the hypocenter is.  It's enough time for people to seek shelter and for certain dangerous systems to shut off, such as trains and natural gas pipes.