Meerkat family huddling together (© stefbennett/Shutterstock)

Sigiriya Rock, Central Province, Sri Lanka (© Jeremy Woodhouse/Getty Images)

Bubbles in the ice of Abraham Lake in Alberta, Canada (© robertharding/Alamy)

Brighton Jetty in Brighton, Adelaide, Australia (© Darryl Leach/Alamy)

View of the Old City in Quebec City, Canada (© RENAULT Philippe/age fotostock)

｢ランタンフェスティバル｣台湾 (© Jung-Pang Wu/Getty Images)

The Hollywood sign overlooking Los Angeles, California (© Sean Pavone/Shutterstock)

The Hollywood sign overlooking Los Angeles, California (© Sean Pavone/Shutterstock)

Dr. Sylvia Earle explores the Great Barrier Reef in a scene from 'Mission Blue' (© Bryce Groark/AP Photo/Netflix)

Pinzon Island tortoise hatchling emerging from its egg at the Charles Darwin Research Station on Santa Cruz Island, Galápagos Islands, Ecuador (© Pete Oxford/Minden Pictures)

Frozen colosseum of ice sticking to the columnar basalt walls surrounding Abiqua Falls, Oregon (© Joshua Meador/Tandem Stills + Motion)

A heart-shaped hole in the rock formation of Calanques de Piana in Corsica, France (© joningall/Getty Images)

Humpback whale feeding on herring off the coast of Kvaløya, Troms, Northern Norway (© Espen Bergersen/Minden Pictures)

The 2019 Lemon Festival in Menton, France (© Mandoga Media/Alamy)

The Diver Giant walks up Hay Street during the 2015 Perth International Arts Festival (© Paul Kane/Getty Images)

Pluto's crescent imaged by NASA's New Horizons interplanetary space probe (© NASA/JHUAPL/SWRI/Science Photo Library)

Wandering albatross pair, South Georgia island (© David Tipling Photo Library/Alamy)

Rifugio Lagazuoi above the clouds with Monte Pelmo in the background, Dolomites, Italy (© Nicolo Miana/eStock Photo)

Giant puppets for Carnival in Olinda, Brazil (© Pulsar Imagens/Alamy)

The interior of the Great Temple of Ramesses II, Abu Simbel, Egypt (© Nick Brundle Photography/Getty Images)

People ice fishing on Gull Lake in Brainerd, Minnesota (© Robert Benson/Cavan)

Pilgrims throwing wind horses into the air above Ganden Monastery for the New Year in Tibet, China (© Ian Cumming/plainpicture)

Wide angle view of rainbow-coloured shipping containers in Fremantle, Australia (© Michael R Evans/Shutterstock)

Acadia National Park in Maine (© emptyclouds/Getty Images)

A polar bear sow and her cubs in Alaska's Arctic National Wildlife Refuge (© Steven Kazlowski/Minden Pictures)

Otter Creek in winter in Brandon, Vermont (© Caleb Kenna/Offset)

一只华莱士飞蛙掠过森林地面 (© Stephen Dalton/Minden Pictures)

Historic nursery land in Emerald Lake Park, Victoria (© Givenworks/Getty Images)