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Couple details from a post on the 52toys website. Its all google translated so take it with a bit of salt of course.
>There is a lot of praise for the parrot and the work done on its engineering and articulation
>The big cat is officially a Saber-Toothed Tiger and they seem to mention that its dabbling with a slightly more realistic and aggressive design
>The Whale includes a tiny Jojo figure as a drive, a manta ray escape vehicle and a Dolphin Torpedo as accessories
>The Lobster is just called a lobster as a placeholder name and they mention that as the biggest animal form so far the transformation is really satisfying
>With the Spider they really wanted to convert the biological features into mechanical details and said that it might not be so scary once it gets painted
>The Bear is called a Panda and has a pretty interesting transformation and apparently the cub can be combined into a "Bamboo Cannon" with some of the other weapon accessories it has.