Musings on the nature of time

I think a lot about the nature of time.The mystics say that it is not actually linear; that past, present, and future occur at the same time, or perhaps in a spiral.  Sometimes I get a hint of that. For instance, time to a redwood tree is very different than time is to a butterfly, or a stone.  Is time measured in the length of a life? But then I consider the migrations of fish and birds, the flow of a river. The collective migration is an organism itself. We don't know when it was born or when it will die.  It just Is. Redwood trees grow together in a grove, meshing their roots in a communal mat, clasped fingers that hold them all upright together as one, growing into the future hundreds of years.One generation of fish gives way to the next, and the next and the next, from the past into the future.
We humans are so egocentric.  We think it's all about us, one life, that's it.