These ambarellas are still green and nowhere near mature but could enlarge further and go yellow in a couple of months.Cockatoos leave a carpet of immature fruit beneath the trees and some actually remain unscathed despite the 80 ft drop to the ground. Ambarella seeds are in a few sections of the core which is like a bit like a woody, spikey apple core. I didnt check if viable seeds were inside but I don't see why not as several huge trees are growing together.