Bowhead whales (Balaena mysticetus), surfacing showing distinctive triangular heads. Igloolik, Foxe Basin, Nunavut, Arctic Canada. (aka Greenland right whale, Arctic whale) [Getty Images]

Bowhead whales (Balaena mysticetus), surfacing showing distinctive triangular heads. Igloolik, Foxe Basin, Nunavut, Arctic Canada. (aka Greenland right whale, Arctic whale) — see more

Bowhead whales (Balaena mysticetus), surfacing showing distinctive triangular heads. Igloolik, Foxe Basin, Nunavut, Arctic Canada. (aka Greenland right whale, Arctic whale)

Photolibrary Mark Carwardine