Katrina Martin / 2020VISION / Flowering Common bluebells (Hyacinthoides non-scripta) with dew, Cumbernauld Glen SWT reserve, North Lanarkshire, Scotland, UK, May. 2020VISION Book Plate.

Tom Vezo / Purple Martin (Progne subis) and Tree Swallow (Tachycineta bicolor) mixed group perching on branch, Crane Creek, Ohio

TJ Rich / Fragrant orchid (Gymnadenia conopsea) in species rich chalk grassland. Martin Down National Nature Reserve, Hampshire, England, UK. June.

TJ Rich / Fragrant orchid (Gymnadenia conopsea) in species rich chalk grassland. Martin Down National Nature Reserve, Hampshire, England, UK. June.

Martin van Lokven / Heather (Calluna vulgaris) flowering in heathland, Lage Vuursche, Netherlands

Alan Murphy/ BIA / Purple Martin (Progne subis) flying, Texas

David Kjaer / Pasque flower (Pulsatilla vulgaris) Martin Down National Nature Reserve, Hampshire

Martin Willis / Purple-crowned Fairywren (Malurus coronatus) male calling to female, Lawnhill River, Queensland, Australia

Martin Willis / Purple-crowned Fairywren (Malurus coronatus) male calling to female, Lawnhill River, Queensland, Australia

Martin Gabriel / Wild Flax (Linum usitatissimum) in flower, near Yerevan, Armenia

Martin Gabriel / Grape hyacinth (Leopoldia caucasica) flowering, Central Armenia, May.

Martin Gabriel / Crocus (Crocus kosaninii) flower, a species occurs in southern Serbia, flowering in a private garden in Bavaria, Germany

Martin Gabriel / Spring Meadow Saffron (Colchicum bulbocodium) flowering in private garden, Bavaria, Germany.

Martin Gabriel / Ironweed (Verbena hastata) flowering in a private garden in Bavaria, Germany

Martin Gabriel / Wild Marjoram (Origanum vulgare) in flower, Bavaria, Germany

Ammonite / Common kingfisher (Alcedo atthis) fishing, Yala National Park, Sri Lanka.

Zoltan Nagy / Starlings (Sturnus vulgaris) flocking with Blackpool Tower in the background. Taken from Martin Mere Nature Reserve, Blackpool, UK. November 2010.

Zoltan Nagy / Starlings (Sturnus vulgaris) murmuration at sunset with Blackpool Tower in the background. Taken from Martin Mere Nature Reserve, Blackpool, UK. November 2010.

David Tipling / Purple Martin (Progne subis) perched in front of American flag, Cape May, New Jersey, USA, May.

David Tipling / Purple Martin (Progne subis) boxes in garden, in Cape May, New Jersey, USA, May.

Ralph Martin / Purple Swamphen (Porphyrio porphyrio), Mallorca, Spain

Alan Murphy / Purple Martin (Progne subis) female, Texas

Alan Murphy / Purple Martin (Progne subis) flying, Texas

Glenn Bartley / Purple Martin (Progne subis) adult and juvenile, British Columbia, Canada

Glenn Bartley / Purple Martin (Progne subis), British Columbia, Canada

Martin Willis / Purple Swamphen (Porphyrio porphyrio) reflected in the water as it feeds chick, Mongers Lake, Western Australia, Australia

Martin Willis / Purple-crowned Lorikeet (Glossopsitta porphyrocephala), Dryandra Woodland State Forest, Western Australia, Australia

Martin Willis / Gouldian Finch (Chloebia gouldiae) male, Flat Creek Station, Georgetown, Queensland, Australia

Martin Gabriel / Fairy Longhorn Moth (Nemophora metallica) feeding on Brown Knapweed flower (Centaurea jacea) Bavaria, Germany

Martin Gabriel / Martagon Lily (Lilium martagon) close-up of flower, Allgaeu Alps, Bavaria, Germany

Martin Gabriel / Wild Thyme / Creeping Thyme (Thymus serpyllum) Allgaeu Alps, Bavaria, Germany, July

Martin Gabriel / Alpine Calamint (Calamintha alpina) flowering, Allgaeu Alps, Bavaria, Germany, July

Martin Gabriel / Early purple orchid (Orchis mascula) Allgaeu Alps, Bavaria, Germany, July

Martin Gabriel / Autumn crocus (Crocus longiflorus) native to Southern Italy, growing in a garden in Bavaria, Germany

Merryn Thomas / Sunset at Old Quay Beach, St. Martin's, Isles of Scilly, UK

Merryn Thomas / Sunset at Old Quay Beach, St. Martin's, Isles of Scilly, UK

Merryn Thomas / Sunset at Old Quay Beach, St. Martin's, Isles of Scilly, UK

Martin Gabriel / Wild thyme in flower (Thymus serpyllum), near Regensburg, Bavaria, Germany, June

Martin Gabriel / Wild thyme in flower (Thymus serpyllum), near Regensburg, Bavaria, Germany, June

Tim Martin / Yellow crab / Goldenrod spider (Misumena vatia) on English lavender (Lavandula angustifolia). Somerset, UK. July

Tim Martin / Yellow crab / Goldenrod spider (Misumena vatia) on English lavender (Lavandula angustifolia). Somerset, UK. July

Tim Martin / Red campion (Silene dioica), Skomer Island, Pembrokeshire Coast National Park, Wales, UK. June

Martin Gabriel / Anemone {Anemone hortensis} flowers amonst leaf litter, Istria, Croatia

Martin Gabriel / Autumn crocus {Crocus speciosus} flowers, Bavaria, Germany

Martin Gabriel / Autumn crocus {Crocus speciosus} flowers, Bavaria, Germany

Martin Gabriel / Autumn crocus {Crocus speciosus} flower, Bavaria, Germany

Martin Gabriel / Autumn crocus {Crocus speciosus} flowers, Bavaria, Germany

Martin Gabriel / Dutch Crocus (Crocus vernus) with dew drops on closed buds, Bavaria, Germany

Martin Gabriel / Desert lilies in flower in rainy season, Namib desert, Namibia

Tom Vezo / Purple martin, male {Progne subis} Texas, USA

Adam White / Purple martin (Progne subis) nest boxes, Pennsylvania USA

Tom Vezo / Purple Martin (Progne subis) male and female perching, Rio Grande Valley, Texas

Martin Willis / Purple-backed Fairywren (Malurus assimilis), Queensland, Australia

Martin Grimm/ BIA / Purple Heron (Ardea purpurea) parent with begging chicks in nest, Baden-Wurttemberg, Germany

Martin Willis / Purple Heron (Ardea purpurea) flying, Inle Lake, Myanmar

Martin Willis / Purple-crowned Fairywren (Malurus coronatus) male, Lawnhill River, Queensland, Australia

Martin Camm / Carwardine / Illustration of Sperm Whale (Physeter macrocephalus), cross-section of head showing spermaceti organ (purple) and spermaceti (pink) (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Mauve Stinger / Purple Stinger (Pelagia noctiluca), Cyaneidae (Wildlife Art Company).

Martin Camm / Carwardine / Illustration of Jack-by-the-wind Sailor / Jack sail-by-the-wind (Velella velella) (Wildlife Art Company).

Adam White / The owner checking her Purple martin nests on location for BBC television series 'Life of Birds', Pennsylvania, USA, July 1997

Martin Gabriel / Lady orchid (Orchis purpurea) in flower, Provence, France

Ross Hoddinott / Fragrant orchid (Gymnadenia conopsea) in chalk grassland with Birds-foot Trefoil (Lotus corniculatus), Martin Down National Nature Reserve, Hampshire, England, UK. June.

Claudio Contreras / Male Purple martin (Progne subis) perched on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Claudio Contreras / Male Purple martin (Progne subis) perched on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Claudio Contreras / Two Purple martins (Progne subis) calling on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Claudio Contreras / Two Purple martins (Progne subis) perched on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Claudio Contreras / Male Purple martin (Progne subis) perched on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Claudio Contreras / Male Purple martins (Progne subis) perched on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Claudio Contreras / Two male Purple martins (Progne subis) perched on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Claudio Contreras / Two Purple martins (Progne subis) perched on rock. El Pardito Island, Islands of Gulf of California Protected Area, Sea of Cortez, Mexico. May.

Martin Willis / Purple-crowned Fairywren (Malurus coronatus) female, Northern Territory, Australia

Martin Willis / Purple-crowned Fairywren (Malurus coronatus) male, Northern Territory, Australia

Martin Willis / Gouldian Finch (Chloebia gouldiae) male, Northern Territory, Australia