Vis­it http://www.loveearth.com for more wildlife clips. Is the link be­tween dol­phins and hu­mans as pro­found as some may be­lieve, or is it just a nat­u­ral ma­mallian in­stinct to pro­tect oth­ers like it? The ex­traor­di­nary ben­e­fits of dol­phin hear­ing are ex­plained here.