our reporter kerstin schweizer went in search of the last dugongs in the philippines. >> we set out from the island of busuanga in the philippines just after sunset. i knew very little about dugongs, but my guides reynante ramilo and archie espinosa had promised i would get to see some. i wanted to see how they live, but they're known to be very shy -- and rare. soon, the boat drew up near a small island. reynante ramilo:the dugong breathe every 5 to 6 minutes. you can see them surfacing in the water. so we are just hoping that we can see some sign that the dugong are here. this is known to be one of their feeding grounds. down below is a large seagrass meadow. we wait but nothing happens. archie espinosa decided to head down. he and reynante work for the non-governmental organization c-3. the seagrass the dugong feeds on is tiny, barely even visible. the dugongs have to root through the seabed for it. they need some 25 kilos of it per day. unfortunately, i never got this close. these images were taken by a local diving school. they're the last surviving dugongs along this coast -- there