spinach does have highcalciu, however it is HIGH IN OXALATE...birds cant process this. it is part of wy they get gout, and kidney issues. so, tho it is good to do dark colored veggies, note that these are usually highest in oxalate as well. stay away from fruits and veggies that are mostly water such as celery and watermelon and iceburg lettuce. you can do a search for foods high in oxalate and be