system
Given the following post, respond as if you're commenting on Reddit:
human
[Music] What kind of evolutionary pressures could create the Rock Lobster?
gpt
Rock lobsters are already a real thing (specifically, there's about 60 species of crustacean that all get classified as part of the Palinuridae family, colloquially called "spiny lobsters" and "rock lobsters", among other names).  Presumably, the one in the song had a carapace that looked close enough like a rock that (if it was partially buried in the sand) you could easily mistake it for one while under a dock.