Scaly-foot gastropod (Chrysomallon squamiferum), the first known animal that can incorporate iron - iron sulfide - with its body, particularly its shell, and probably the only animals can do so.
Living at hydrothermal vents at Indian Ocean, this species doesn’t imbue iron sulfide into its body by themselves; it is done by bacteria (albeit the scheme how the bacteria work in the snail’s body to create iron sulfide remains speculated).
The island of Hawai’i and the nearby isles drift around 5–10 cm per year. They drift northwest from hotspots which emit magma that formed these islands millions of years ago.
The active hotspots below the archipelago is assumed to drift the islands further until at one point, it’ll submerge the archipelago. Also, there will be new islands formed from the hotspots’ activity.
Square-cube law is one of the principles that could explain why: humans can’t grow to such size as in picture above, why elephants can’t move swiftly and regulate their body temperature slowly, and why dinosaurs are heavily built.
According to this principle, humans will collapse under their own weight if they grow until 50 meters tall (or 20 meters). This also explains why ants can lift matters that are several times heavier than their body, and why humans can’t do the same regardless of exercises.
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References
Absurd Creature of the Week: The Badass Snail That Has a Shell Made of Iron