@Itsmehello I've left them overnight for a while to work on my Sims retail lots before and they were fine. Obviously there are some pets where you can see needs decline, like dogs, cats and horses so I always take them along with me and have made pet friendly vacation lots. Plus the market stalls sell supplies for them too.
But your Cottage Living animals should be okay. I haven't left mine for more than about 36hrs but when I returned they were in the same spot in which I left them.🐣
I run a backup save just incase. So I'd do that and leave it at the point of you setting off, that way it allows for any issues and there's no harm done if you return to a chicken mutiny...plus nobody wants to anger a llama!
The jungle aspiration is done over several trips anyway because the temple is different each time you visit. Plus it's impossible to collect everything in one trip and as your skill increases you find rarer items. So taking a few short trips with the Seldom Sleepy reward trait is how I do it. You may find that you can leave your livestock for a couple of days or more but with a backup it keeps you covered. There is a bug where other Sims see needs decline while another Sim is away, so I don't know if that affects livestock but it's worth bearing in mind.🦙
Good luck in the jungle, it's one of my favourites.
