Sylvain Cordier / RF - Common loon (Gavia immer) with chick on back. Michigan, USA. June. (This image may be licensed either as rights managed or royalty free.)

Sylvain Cordier / Common Loon (Gavia immer) on lake carrying chick on back , Michigan, USA. June.

Sylvain Cordier / Common Loons (Gavia immer) one diving underwater , Michigan, USA. June.

Markus Varesvuo / Red-throated Diver (Gavia stellata) calling, Iceland, June.

Markus Varesvuo / Red-throated Diver (Gavia stellata) taking off, Iceland, June.

Markus Varesvuo / Red-throated Diver (Gavia stellata) portrait, Iceland, June.

Markus Varesvuo / Black-throated Diver (Gavia arctica) Vaala Finland, June.

Markus Varesvuo / Black-throated Diver (Gavia arctica) Vaala Finland, June.

Espen Bergersen / Common Loon (Gavia immer) flapping wings in water, Iceland, May.

John Shaw / Common loon (Gavia immer) with a chick alongside. British Columbia, Canada. June.

Marie Read / Common loons (Gavia immer), two adults and chick swimming on a misty lake in early morning, Michigan, USA. June.

Connor Stefanison / Common loon (Gavia immer) sits on her nest at sunset in the Cariboo region of British Columbia, Canada, taken with remote, May

Espen Bergersen / Red throated diver (Gavia stellata) pair on water with reflection, Troms, Norway, June.

Danny Green / Black-throated diver (Gavia arctica), Finland, June.

Danny Green / Black-throated diver (Gavia arctica) on near waters edge, Finland, June.

Danny Green / Black-throated diver (Gavia arctica) displaying, Finland, June.

Markus Varesvuo / Black-throated diver (Gavia arctica) on water, Finland, May.

Markus Varesvuo / Black-throated diver (Gavia arctica) on water, Finland, May.

Terry Whittaker / Two Red-throated divers (Gavia stellata) on a lake, vocalising, Iceland, July.

Erlend Haarberg / Red-throated diver (Gavia stellata) portrait, Varanger, Finnmark, Norway, June

Laurie Campbell / Black-throated diver (Gavia arctica) Loch Maree, Beinn Eighe National Nature Reserve, Wester Ross, Scotland, June

Markus Varesvuo / Black-throated Diver (Gavia arctica) Vaala Finland June

Mark Hamblin / 2020VISION / Red-throated diver (Gavia stellata) adult pair displaying on breeding loch, Flow Country, Highland, Scotland, UK, June. Did you know? The Flow Country of Caithness and Sutherland is home to the larges...

Mark Hamblin / 2020VISION / Red-throated diver (Gavia stellata) adult on breeding loch, Flow Country, Highland, Scotland, UK, June,

Mark Hamblin / 2020VISION / Red-throated diver (Gavia stellata) adult on breeding loch, Flow Country, Highland, Scotland, UK, June, vertical crop of image number 01358766

Orsolya Haarberg / Black-throated diver (Gavia arctica) portrait on water, Pasvik, Finmark, Norway, June

Markus Varesvuo / Red-throated Diver (Gavia stellata) adult with two young chicks on water, Vaala, Finland, June

Markus Varesvuo / Red-throated Diver (Gavia stellata) on water, cleaning feathers, Vaala, Finland, June

Markus Varesvuo / Adult Red-throated Diver (Gavia stellata) on water with chick, Vaala, Finland, June

Markus Varesvuo / Red-throated Diver (Gavia stellata) portrait at edge of lake, Vaala, Finland, June

Markus Varesvuo / Red-throated Diver (Gavia stellata) taking off with fish, Vaala, Finland, June. Magic Moments book plate.

Wild Wonders of Europe / Cairns / Red throated diver (Gavia stellata) on water, in breeding plumage, Bergslagen, Sweden, April 2009

Markus Varesvuo / Red-throated Diver (Gavia stellata) adult with two young chicks, Vaala, Finland

Markus Varesvuo / Black-throated diver (Gavia arctica) portrait, Finland, June

John Cancalosi / Red throated diver (Gavia stellata) taking off Shetland Isles

Pal Hermansen / Red-throated diver (Gavia stellata) taking off from water with fish in beak. Ski, Viken, Norway. June.

Pal Hermansen / Black-throated diver (Gavia arctica) taking off from water. South Sweden. July.

Marie Read / Common loon (Gavia immer) adult diving below water's surface in search of food while two chicks swim above, Michigan, USA.

Jussi Murtosaari / Black-throated loon (Gavia arctica). Laukaa, Central Finland. August.

John Shaw / Common loon (Gavia immer) carrying chick on its back. British Columbia, Canada. June.

John Shaw / Common loon (Gavia immer) with a chick alongside. British Columbia, Canada. June.

John Shaw / Common loon (Gavia immer) carrying a chick on its back. British Columbia, Canada. June.

John Shaw / Common loon (Gavia immer) chick following adult. British Columbia, Canada. June.

John Shaw / Common loon (Gavia immer) carrying a chick on its back. British Columbia, Canada. June.

John Shaw / Common loon (Gavia immer) carrying a chick on its back. British Columbia, Canada. June.

John Shaw / Common loon (Gavia immer) carrying chick on its back. British Columbia, Canada. June.

John Shaw / Common loon (Gavia immer) carrying chick on its back. British Columbia, Canada. June.

John Shaw / Pacific loons (Gavia pacifica) on tundra pond with chick, Nome, Alaska, USA, July.