@bbcearth: Solving a 40-year-old dolphin mystery 🐬. Producer and director Yolly Bosiger reveals how the team used remote camera traps to film one of Blue Planet III's most extraordinary behaviours: dolphins using sea sponges as tools to hunt fish 🎥 #BluePlanet3 returns to uncover extraordinary new stories and lives hidden beneath our oceans. Click the link in our bio to find out where to watch the full series. #Dolphin #Hunting #FilmingFirst