Alex Mustard / Portrait of a male short snouted seahorse (Hippocampus hippocampus) in sea oak seaweed (Halidrys siliquosa). Devon, England, United Kingdom. British Isles. English Channel. North East Atlantic Ocean.

Nick Upton / Forest caterpillar hunter (Calosoma sycophanta) feeding on a Gypsy moth caterpillar (Lymantria dispar) it has killed in a Holm oak tree, Bacu Goloritze ravine, Baunei, Sardinia, Italy, May.

Marie Read / Blue jay (Cyanocitta cristata) holding an acorn in its bill whilst perched on tree stump, with autumn foliage, New York, USA, October.

SCOTLAND: The Big Picture / Stream in spate in native oak woodland in summer, Clonaig, Kintyre, Argyll, Scotland, UK, July 2015.

Nick Upton / White stork (Ciconia ciconia) pair performing an up-down display with bill clattering on their nest in an Oak tree, Knepp estate, Sussex, UK, April 2019. This is the first recorded instance of White s...

Nick Upton / White stork (Ciconia ciconia) male landing with nest material and joining his mate on their nest in an Oak tree at sunset, Knepp estate, Sussex, UK, April 2019. This is the first recorded instance of...

Dave Bevan / Slow motion clip of two pairs of Jackdaws (Corvus monedula) squabbling over nest site, Worcestershire, England, UK, May.

Bernard Castelein / Oak (Quercus robur) in Heather (Calluna vulgaris) at sunrise, Klein Schietveld, Brasschaat, Belgium

Theo Bosboom / Autumn foliage including Beech and Oak leaves and Rowan berries floating in the current of a mountain stream, La Hoegne, Ardennes, Belgium.

Theo Bosboom / Autumn leaves from Beech trees, Oak trees and Birch trees floating under water in the current of a mountain stream, La Hoegne, Ardennes, Belgium.

Theo Bosboom / Autumn leaves from Beech, Oak and Birch trees floating on water, taken from underwater, Ardennes, La Hoegne, Belgium.

Theo Bosboom / Oak and Beech tree leaves in autumn colours floating on water of mountain stream, La Hoegne / High Fenn, Ardennes, Belgium