Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Doug Wechsler / American toad (Bufo americanus) crossing road at night in front of car headlights, Philadelphia, Pennsylvania, USA, March

Steve Knell / Harlequin duck (Histrionicus histrionicus) male standing in rapids, Iceland, May

Alex Mustard / A group of highly invasive Zebra mussels (Dreissena polymorpha) growing on an underwater structure, Whittlesea, Cambridgeshire, UK.