Mawkish chieftain

While I was waiting to see my GP yesty, a news item came on the medical-centre TV about a previously unknown behaviour that's been observed in a certain species of dolphin. In what's theorised to be an attempt at either impressing or scaring females, males are popping up out of the water wearing a foraged sea sponge on their head. I'm not making this up. Stupid dolphins. Or...smart dolphins preparing for Halloween a week in advance.