Yes, I believe that all living things have a soul. The defining characteristic for this is that most creatures have a desire to survive and reproduce, or at least the ability to do such. It is also my assumption that there doesn’t need to be a mother-child bond within every living species either. Most mammals would share this trait, but it may only play a small role in the kigdom of life. I also believe that plants and trees have deep spirits, but they don’t provide for, or take care of their offspring.
Here’s a prime example of what I’m trying to say: what gives a Bristlecone Pine Tree the desire to live, grow, and stay in one place for thousands of years, and remain content? why would a Bristlecone Pine want to live for thousands of years, grow at 10,000-12,000 feet above sea level; while enduring the most inhospitable climate conditions? They grow in the windiest, most uninhabitable areas. They even grow in places that lack moisture! It is one of the oldest living tree species in the world. There is an incredible beauty about the Bristlecone; a beauty that I cannot translate. It is very wise, and unknowable to us humans.