Its a kids sci-fi picture book I loved as a child. I know it was popular in the late 80s or early 90s as that was when I was a kid. The book reminded me of “The Odyssey” but in space, and animal characters instead of humans. Each planet they traveled to, two of them would decide to stay. Sometimes their decision to stay would be a bad decision and sometimes it was okay. in the end, there was only one or two animals still on the ship, and on the last planet they visit, all their friends they lost throughout the journey, ended up being there.