Little tern chicks and fledglings are always hungry. At this stage of their young lives their whole purpose is to eat. They do little else. They sit around on the beach all day and wait for one of the parent birds to return with food. As soon as they hear the unique advertising call of the parent they will jump up, run towards the call, opening their wings and flapping them furiously in an effort to be seen and, more importantly, be the first to be fed from the brood. They emit a shrill sound - one that is also unique to them - so that they can be found by the parent. A little tern egg weighs 10g and this is the weight of the hatchling. Within three weeks this hatchling will develop into a fledgling - a fully-formed little tern that weighs the same as an adult at 50g. This extraordinary growth is due to the quantity and quality of fish that they eat. Photo credit: Neil Bowman.