[2020] Chuka and Champawat collection bonus item (spoiler, like Kudzu's hidden garden or Juggernaut's ooze potion)

You get three cubs with the fourth collection of Chuka and Champawat.

Some screens here

You can choose one of three differently coloured cubs to 'wear' on your back. They are separate from back items and stay until you manually put them away.

You select them from one of multiple book-like items gathered during the collection.

Edit: another pro, it doesn't disappear during emotes like back items do. You can dance with a cub on your back :)

Edit 2: you have 5 of these book-like items that are account bound, so you can spread the tigers across your characters. You can also of course use a book to get a tiger on a character and then move it to another character. Cubs for everyone! You can use the same book multiple times, tigers never disappear unless you specifically put them away.