The Mystery Bones of Infant Island (インファント島の怪骨,   Infanto-jima no kai kotsu?), also known as Infant Island's Kai Kotsu is a turtle kaiju created by Toho that first appeared in the 1964 Godzilla film, Mothra vs. Godzilla.


The official name "Mystery Bones of Infant Island," is a translation of the name for the creature found in a 2012 toy of it,[1][2] which reads "Infanto-jima no kai kotsu." Officially licensed t-shirts featuring Skeleturtle that were sold in Japan refer to the creature in English as "Infant Island's Kai Kotsu."



The Mystery Bones of Infant Island is purely white and gray, with black eyes, and a bland, pale shell with no visible scutes. It has a fairly long neck, and very short limbs, which have tiny bone fragments visible.


The Mystery Bones' direct origins are unknown, but it's possible that it was either a turtle mutated by radiation on Infant Island or a turtle of an unknown species.


Mothra vs. Godzilla

The Mystery Bones made a very short appearance on Mothra vs. Godzilla, lasting only about 38 seconds on screen and in the background. It was found on Infant Island, which had a lot of radiation and lifeless skeletons lying around. None of the characters ever directly interact with or notice it.


Godzilla: Rulers of Earth

The Mystery Bones can be seen on Infant Island running from the battle between Mothra and Battra in Godzilla: Rulers of Earth #19.


List of appearances




This is a list of references for Mystery Bones of Infant Island. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: [1]

Film-based kaiju
Godzilla kaiju
King Kong kaiju
Mothra kaiju
Gamera kaiju
Other kaiju
Scrapped kaiju