Animals can produce incredibly strong substances - so who makes the toughest?
Remoras and shark
BBC Wildlife contributor Stuart Blackman answers your wild question. 
Sea turtle
BBC Wildlife contributor Karen Emslie answers your wild question. 
Screenshot of sperm whale giving birth video
In the encounter of a lifetime, photographer Kurt Amsler meets a sperm whale only seconds after its birth. 
Humpback whale
The basics of feeding and breaching behaviour explained, with Rob Lott from Whale and Dolphin Conservation. 
New research into orcas’ hunting behaviour provides a clue to the evolution of menopause.
Diver and reef manta ray.
Discover some of the less-known truths about these amazing leviathans.
Dr Dan Exton scuba diving
Dr Dan Exton explains why volunteering is vital while pursuing a career as a marine researcher. 
Lisa-Ann Gershwin reveals fascinating facts about these ancient, marine coelenterates.  
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