Beached sperm whale near Lisbon Portugal. The inability to make deep dives caused by barotrauma ( exploded ear drums ) what can cause this ? Navy sonar experiments or Underwater volcanic explosions Which one of those did that to this whale? We don’t know Hope this big gentle giant can reunite with his pod Aloha! Video via @portugalforeels | OCEAN DEFENDER - Hawaii

Why do whales beach themselves? Scientist say the stranding of 97 pilot whales near Albany may give an insight 🐋 MORE: ab.co/3OugjEQ | ABC Great Southern

Studies are underway into some of the whales which stranded themselves at Cheynes Beach in July. Scientists are using CT scans to reconstruct the inner-ear of the mammals. More: ab.co/3O93w9l | ABC Great Southern

Scientists still don't know why some pods of pilot whales come to shore and beach themselves. But there's hope last week's mass stranding in Western Australia could help solve the mystery. 7.30 – Stream now on ABC iview: https://ab.co/StreamABCiview | 7.30