Each of those posts were for a different story. I figured if one rang a bell it would allow for easy quoting. I should have been more clear.
I 'think' the first is a short story by Gregg Bear. The lobster tells the story as seen by a time traveller trapped in some future migration. Its mostly a monologue but there is some action when they are spotted by a group of sharks.
I don't think it is 'Blood Music' but I will have to reread it to be sure. If I remember correctly 'Blood Music' is set on a different planet.
Too bad there isn't a search engine that allows you to plug in book/story details. If I knew one iota about programming or coding I would make us one.
Anyway, I don't think this story was a full book but possibly a story in a magazine or on a website. I remembering it not being a very long read.