In the plant kingdom, the largest known single seed is the coconut palm. This tall, palm-like tree is found only on the Seychelles Islands in the Indian Ocean. The seeds of coconut palm look like two leaves joined together, and can reach about 50 centimeters in length. The fruit of the coconut palm is a huge heart-shaped fruit that looks like two coconuts joined together. When sailors from Europe first saw the sea coconut floating on the sea, its shape was reminiscent of a human buttocks. The tourists who came one after another regarded the seeds of sea coconuts as excellent souvenirs, so smart locals began to collect sea coconuts in large quantities and sell them to tourists. Wild sea coconuts therefore face huge threats. The seeds of coconut palm are also very popular among amateur palm tree growers, but coconut palm is very difficult to cultivate. Its germination process is very slow and can last for several years.