The tail of this sperm whale 30 feet wide. We approached from the tail since 'Rada' of the whlae is at the head and very sensitive. We didnot want the noisy speed boat engine to hurt the whale. This whale is bigger than Boeing 737. Oh yes..it stayed at the surface of the sea for about 5 minutes. We watched it and wondered how this lovely creature, huge and gentle, could grow to such a huge size.