Shane Gross / Caribbean reef shark (Carcharhinus perezi), two from below, one close up. Caribbean Sea off Gardens of the Queen National Park, Cuba.

Shane Gross / American crocodile (Crocodylus acutus) with open mouth amongst Seagrass (Alismatales). Gardens of the Queen National Park, Cuba.

Claudio Contreras / Black grouper (Mycteroperca bonaci) and Caribbean Reef Shark (Carcharhinus perezi), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January

Claudio Contreras / American crocodile (Crocodylus acutus), underwater, Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable species.

Claudio Contreras / Silky shark (Carcharhinus falciformis) two swimming together, Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable species.

Alex Mustard / American crocodile (Crocodylus acutus) reflected in the surface as it floats, Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Sean Crane / Kob (Kobus kob) male, Queen Elizabeth National Park, Uganda

Adri de Visser / African Lion (Panthera leo) female looking at Kob (Kobus kob) calf, Queen Elizabeth National Park, Uganda

Mark MacEwen / Banded mongoose (Mungos mungo) juvenile sleeping on adult 'escort', Queen Elizabeth National Park, Mweya Peninsula, Uganda, Africa.

Claudio Contreras / Queen Angelfish (Holacanthus ciliaris) among other coral fish. Cancun National Park, Caribbean Sea, Mexico.

Nick Turner / Crater lake with reflections of clouds in the water, Queen Elizabeth National Park, Uganda, January 2009.

John Waters / Banded Mongoose (Mungos mungo) group resting together in shade during heat of mid-day, Mweya Lodge, Queen Elizabeth National Park, Uganda, E. Africa