Claudio Contreras / Grey whale (Eschrichtius robustus) calf, San Ignacio Lagoon, El Vizcaino Biosphere Reserve, Baja California, Mexico, February

Edwin Giesbers / Orangutan baby (Pongo pygmaeus) head portrait of baby, Semengoh Nature reserve, Sarawak, Borneo, Malaysia. Endangered.

Sergio Hanquet / Short-finned pilot whale (Globicephala macrorhynchus) calf, head above surface. Tenerife, Canary Islands.

Doug Perrine / Humpback whale (Megaptera novaeangliae) calf riding on mother's head. Near Nomuka Island, Ha'apai Islands, Tonga.

Doc White / Risso's dolphin (Grampus griseus) female and calf aged two days, swimming at surface. Calf with head out of water, many scars on female. California, USA.

Tony Wu / Humpback whale (Megaptera novaeangliae australis) female with calf swimming above head. Rake marks on fluke created by Orca or False Killer whale predators. Vava'u Islands, Tonga.

Mark Carwardine / Grey whale / gray whale (Eschrichtius robustus) aerial, curious female and calf, San Ignacio Lagoon, Baja California, Mexico

Mark Carwardine / Grey whale / gray whale (Eschrichtius robustus) aerial, curious female and calf approaching boat, San Ignacio Lagoon, Baja California, Mexico

Mark Carwardine / Grey whale / gray whale (Eschrichtius robustus) aerial, curious female and calf approaching boat, San Ignacio Lagoon, Baja California, Mexico

Claudio Contreras / Grey whale (Eschrichtius robustus) calf, San Ignacio Lagoon, El Vizcaino Biosphere Reserve, Baja California, Mexico, March

Claudio Contreras / Tourist touching Grey whale (Eschrichtius robustus) calf, San Ignacio Lagoon, El Vizcaino Biosphere Reserve, Baja California, Mexico, March

Claudio Contreras / Grey whale (Eschrichtius robustus) and calf, Magdalena Bay, Baja California, Mexico, February