Amatsu Ecology

Disclaimer: This is merely a plausible explanation for the monster(s) in this article, and should not be considered canon.

In-Game Information
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Taxonomy
The Amatsumagatsuchi is classified tecnhically as an Elder Dragon, bearing resemblances to some of the true elder dragons, but is mainly in its own class. It can be seen as being in the same vein of Elder Dragons such as Yama Tsukami and Ceadeus, in that it is placed in this class because it does not fit into any other class, but this should not be considered true, as it displays many classic elements of a dragon.

Habitat Range
Being incredibly large, the Amatsumagatsuchi has limited places it can go. It lacks appendages strong enough to support it on land, so it spends much of its time airborne. Its many fins and wing-like parts would also make it hard for the Amatsumagatsuchi to fit in among forests, but the fact it spends much of its time residing in storms and it utilises the water element, it is possible Amatsumagatsuchi rests near the ocean. This could explain the similarities it bears with leviathans.

Ecological Niche
Not particularly interacting with other monsters, the Amatsumagatsuchi's role in the environment is unclear. In the air, it is unmatched in flight capabilities and weather control, but at the altitude it flies in it would not encounter much competition. It is currently unclear what one would feed on, but the position of its snout and sharp teeth suggest it can feed on meat.

Biological Adaptations
The Amatsumagatsuchi has a large amount of fins and wings along its body, which contribute to its ability to fly smoothly through the air. Its horns are large compared to the size of its head, much closer to the size of the fins. Whilst its forearms/wings are long, they are slender and designed for flight, not for walking. The amount of webbing in its fins and wings makes the Amatsumagatsuchi seem larger than it actually is, as they billow out in the wind. Its actual body structure is very close to a Leviathans, long and curvy, with small back legs and a fairly large tail. It is quite possible Amatsumagatsuchi evolved from a sea-faring dragon, but their is little proof other than its similarities to leviathans to support this theory. Its control over storms surpasses even that of Kushala Daora, but it is unknown how it uses this power. The large amount of fins in cooperation with the horns could play a role in this power, but the only thing known about this control is that once the Amatsumagatsuchi dies, the storm will dissipate within seconds.

Behaviour
Living mainly in the sky and mountain tops, the Amatsumagatsuchi is a mainly passive Elder Dragon, but the frequency that it creates storms could be dependent on its mood. It does not take kindly to anything invading its airspace, as shown when it shoots down an airship on a discovery mission. When truly angered, it does not calm down easily, having two stages of rage.