Adrian Davies / Felt saddle fungus (Helvella macropus) among moss, Sussex, UK. September 2017.

Andy Sands / White saddle fungus (Helvella crispa) Bedfordshire, England, UK . Focus stacked image

Andy Sands / Elfin saddle fungus (Helvella lacunosa) Bedfordshire, England, UK, October . Focus stacked image

Staffan Widstrand / False morel (Gyromitra esculenta) Musteika Village, Lithuania, May.

Paul Hobson / Snail on elfin Saddle fungus (Helvella lacunosa), Longshaw, Derbyshire, UK.

Adrian Davies / White Saddle Fungus (Helvella crispa) in Beechwood, Surrey, England, UK, November.

Adrian Davies / White Saddle Fungus (Helvella crispa) in Beechwood, Surrey, England, UK, November.

Staffan Widstrand / Fungus (Gyromitra ambigua) closely related to False morel (Gyromitra esculenta), Ulvsbomuren, Bergslagen, Sweden

Adrian Davies / Common white helvella fungus {Helvella crispa} amongst beech leaf litter, UK

George McCarthy / False morel fungus {Gyromitra esculenta} UK

George McCarthy / Black helvella fungus {Helvella elastica} UK

George McCarthy / Smooth stalked helvella fungus {Helvella elastica} amongst beech leaf litter, UK

Karine Aigner / Portrait of a Blue-headed vireo, (Vireo solitarius) with white background, Block island, Rhode Island, USA. Bird caught during scientific research.

Scott Leslie / Blue-headed Vireo (Vireo solitarius) male calling, Maine

Alan Murphy / Blue-headed Vireo (Vireo solitarius) male, Texas

Alan Murphy / Blue-headed Vireo (Vireo solitarius) male, Texas

Alan Murphy / Blue-headed Vireo (Vireo solitarius), Texas

Alan Murphy / Blue-headed Vireo (Vireo solitarius), Texas

Glenn Bartley / Blue-headed Vireo (Vireo solitarius), Newfoundland, Canada

Barry Mansell / Solitary Vireo / Blue Headed Vireo (Vireo solitarius) perched, High Island, Texas, USA, April

Marie Read / Male Blue-headed / Solitary vireo (Vireo solitarius) in breeding plumage singing, New York, USA, May

Scott Leslie / Blue-headed Vireo (Vireo solitarius), Nova Scotia, Canada

Tom Vezo / Blue-headed Vireo (Vireo solitarius) portrait, Rio Grande Valley, Texas

Tom Vezo / Blue-headed Vireo (Vireo solitarius) perched on branch, Rio Grande Valley, Texas