system
Given the following post, respond as if you're commenting on Reddit:
human
We know human body is quite full of water (~2/3) but is that ratio above average among other animals? And which animals have the most and least amount of water in their body compared to their size?

The title.
gpt
The least amount of water is probably in clams and other bivalves, whose shells constitute about 70% of their body mass. The shells are calcium carbonate on an organic matrix and have no water.

Jellyfish are probably the most watery creatures, at 95% water.