May 2021, day by day.

Cherry blossoms at the Japanese Tea Garden in Golden Gate Park, San Francisco, California (© luisascanio/iStock/Getty Images)

2021-05-01

Burchell's zebra stallions, Rietvlei Nature Reserve, South Africa (© Richard Du Toit/Minden Pictures)

2021-05-01

Poster for Teacher Appreciation Week by 12-year-old Caroline Holt, 7th-grade student at the Bush School, Seattle, Washington (© Caroline Holt/Eugenia Chang)

2021-05-03

Mainau, Lake Constance, Germany (© Amazing Aerial Agency/Offset by Shutterstock)

2021-05-03

Grey seal hitching over a beach in Donna Nook, North Lincolnshire, England (© Frederic Desmette/Minden Pictures)

2021-05-03

The Great Pyramid of Cholula, in Cholula, Puebla, Mexico (© mauritius images GmbH/Alamy)

2021-05-04

'Now & Forever,' a mural by Tristan Eaton honoring health care workers, May 11, 2020, in New York City (© Timothy A. Clary/AFP via Getty Images)

2021-05-06

Norcross Brook and wetlands near Moosehead Lake in Piscataquis County, Maine (© Aaron Black-Schmidt/Tandem Stills + Motion)

2021-05-06

Tamihi Creek near Chilliwack, B.C. (© Jason Wilde/TANDEM Stills + Motion)

2021-05-07

Black-tailed godwits, Netherlands (© Edward van Altena/Minden Pictures)

2021-05-07

Sea otter mother and newborn pup, Monterey Bay, California (© Suzi Eszterhas/Minden Pictures)

2021-05-08

Sea otter mother and newborn pup, Monterey Bay, California (© Suzi Eszterhas/Minden Pictures)

2021-05-09

Sattais Kacheri at Amer Fort in Jaipur, India (© YURY TARANIK/Shutterstock)

2021-05-09

The Hōkūle'a, a traditional Hawaiian voyaging canoe, departs for a 3-year voyage from Honolulu, Hawaii, on May 17, 2014 (© Reuters/Alamy)

2021-05-10

Tulip field in Miesbach, Bavaria, Germany (© Rüdiger Hess/geo-select FotoArt)

2021-05-10

A pink fringed tulip in Ottawa (© colimachon/Getty Images)

2021-05-10

Grinnell Lake, Glacier National Park, Montana (© Pung/Shutterstock)

2021-05-10

A view across the River Shannon in Limerick, County Limerick, Ireland (© Piotr Machowczyk/Shutterstock)

2021-05-11

Shikisai no Oka flower gardens in Biei, Japan (© Tanya Jones/Shutterstock)

2021-05-12

Amazon rainforest with fog in the morning near Alta Floresta, Mato Grosso, Brazil (© Pulsar Imagens/Alamy)

2021-05-13

Buttermere, Lake District, England (© Stewart Smith/Alamy)

2021-05-14

Telescopes and star trails at Paranal Observatory, Atacama Desert, Chile (© Matteo Omied/Alamy)

2021-05-14

Aerial view of El Peñón de Guatapé, Guatapé, Antioquia, Colombia (© Amazing Aerial Agency/Offset by Shutterstock)

2021-05-15

Gwalior Fort in Madhya Pradesh, India (© f9photos/iStock/Getty Images Plus)

2021-05-16

Ålesund, Norway (© AWL Images/Offset by Shutterstock)

2021-05-17

Centre Pompidou Málaga in Málaga, Spain (© Wim Wiskerke/Alamy)

2021-05-17

Fallen rhododendron petals line a trail on Grassy Ridge Bald, Pisgah National Forest, North Carolina (© aheflin/Getty Images Plus)

2021-05-18

Fallen rhododendron petals line a trail through Pisgah National Forest, North Carolina (© aheflin/Getty Images Plus)

2021-05-19

A bee dives into an East Indian lotus flower at Kenilworth Park and Aquatic Gardens in Washington, DC (© Linda Davidson/The Washington Post via Getty Images)

2021-05-19

Hartland Point Lighthouse, Devon, England (© Adam Burton/Alamy Stock Photo)

2021-05-20

Whooping cranes taking off during spring migration in South Dakota (© Gerrit Vyn/Minden Pictures)

2021-05-20

The medieval walled town in Tossa de Mar, Catalonia, Spain (© dleiva/Alamy)

2021-05-21

The renovated Rose Main Reading Room inside the New York Public Library Main Branch, New York City (© Sascha Kilmer/Getty Images)

2021-05-22

The Infinite Bridge, designed by Danish architects Niels Povlsgaard and Johan Gjødes, in Aarhus, Denmark (© Kosmaj/Shutterstock)

2021-05-23

Sperm whale off the coast of Roseau, Dominica, in the Caribbean Sea (© Tony Wu/Minden Pictures)

2021-05-24

Bodhi Tree in Bodh Gaya, India (© Rosita So Image/Getty Images)

2021-05-25

Geological site of Hopewell Rocks in New Brunswick (© YAY Media AS/Alamy)

2021-05-25

The total lunar eclipse of April 4, 2015, photographed over Monument Valley, Utah (© Alan Dyer/Alamy)

2021-05-26

'I Can Hear It,' an installation by artist Ivars Drulle on the beach by the villages of Middelkerke and Westende, Belgium (© Arterra Picture Library/Alamy)

2021-05-26

View from Varandha Ghat in the Western Ghats, Maharashtra, India (© AmitRane1975/iStock/Getty Images Plus)

2021-05-27

Robin's nest with a brown-headed cowbird egg (© Edward Kinsman/Science Photo Library)

2021-05-27

Alley with red walls and bamboo grove in Wuhou Temple, Chengdu, Sichuan province, China (© Eastimages/Getty Images)

2021-05-28

California sea lion in a forest of giant kelp near the Channel Islands of California (© Nature Picture Library/Alamy)

2021-05-29

Military Women's Memorial, located at the gateway to Arlington National Cemetery, Virginia (© Brycia James/Getty Images)

2021-05-31

Waterfall at Pöllat Gorge near Neuschwanstein Castle, Bavaria, Germany (© Gary Whitton/Alamy)

2021-05-31

A pair of adult bald eagles (Haliaeetus leucocephalus) with chick at Yukon River, Yukon (© Mark Newman/Minden Pictures)

2021-05-31

Aerial view of the Grotta della Poesia (Poetry's Cave) near Roca, Lecce, Italy (© Amazing Aerial Agency/Offset by Shutterstock)

2021-05-31