Humpback Whale Megaptera novaeangliae
Humpback whales are massive, growing to 17 metres in length. Their huge, dark bodies are flanked by enormous pectoral flippers growing up to around a third of their body length. They use their highly-manoeuvrable flippers for hunting by slapping the water and for swimming and even possibly regulating their body temperature. Image: Natural England/Rebecca Walker (Flickr).