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Lunge-feeding fin whale (Balaenoptera physalus) showing distended throat grooves, Northeast Atlantic, off Morocco, North Africa, Africa

Amazing closeup of a lunging Minke whale (Balaenoptera acutorostrata) feeding on krill. Some of these small euphausiids are still hanging on to the expanded grooves. St. Lawrence estuary, Canada

A perfect oblique lunge of a Minke whale (Balaenoptera acutorostrata) surface feeding in the early evening. Its Grooves are expanded and water is purged out, two main characteristics of a feeding strike. St. Lawrence estuary, Canada

A dense net of blood vessels colour the belly of Minke whales (Balaenoptera acutorostrata) named Picasso pink during high feeding activity. St. Lawrence estuary, Canada

Like a piece of art thousands of waterdrops cover the expanded belly of a Minke whale (Balaenoptera acutorostrata) performing a ventral arc. St. Lawrence estuary, Canada

Closeup of a Minke whale (Balaenoptera acutorostrata) showing the beautiful pattern of parallel grooves near the tip of the snout. St. Lawrence estuary, Canada

Fin whale (Balaenoptera physalus) showing throat grooves during a feeding lunge at the surface. Cape Cod, USA.

Minke whale ( Balaenoptera acutorostrata) spy hopping, showing throat grooves. Slender rostrum typical of minke whales. Husavik, Iceland

Minke whale (Balaenoptera acutorostrata) lunge feeding at surface showing pink throat grooves. Olafsvik Iceland

Closeup of the expanded grooves of a giant Blue whale (Balaenoptera musculus) during a lateral lunge, a feeding strike occasionally seen in the St. Lawrence estuary, Canada.

Risso's dolphin, Grampus griseus, at the surface in the Azores showing multiple scars along its back (RR)

Pair of Risso's Dolphin, Grampus griseus, swimming off the Azores. Note the groove in the melon (RR)

Minke whale (Balaenoptera acutorostrata) lunge feeding at surface showing throat grooves, Husavik, Iceland

The sponging mouthparts consist of a fleshy, elbowed labium, at the distal end of which are large, sponge-like organs called the labella (singular, labellum). The labella is a complex structure consisting of many grooves, called pseudotrachea, which sops up liquids much like a sponge does.

Red bench next to a forest path in a summer green beech forest, way in the Kalkalpen National Park, Upper Austria, Europe

Autumn coloured beech forest in the Appenzeller Alps near Wasserauen, Canton of Appenzell Inner-Rhodes, Switzerland, Europe

Coastal forest, Westrand Darss, Western Pomerania Lagoon Area National Park, Mecklenburg-Western Pomerania, Germany, Europe

In the 'spook forest' near Nienhagen, Bad Doberan district, Mecklenburg-Western Pomerania, Germany, Europe

The wall of the Grey Glacier flows into Lake Grey, Torres del Paine National Park, Patagonia, Region de Magallanes y de la Antartica Chilena, Chile, South America

Winter beech forest in Planavy, Bile Karpaty, White Carpathian Mountains, protected landscape area, Moravia, Czech Republic, Europe

The Grey Glacier flows into Lake Grey, Torres del Paine National Park, Patagonia, Region de Magallanes y de la Antartica Chilena, Chile, South America

Plowed field, furrows, black earth, Upper Dinger Moos, Oberding, Upper Bavaria, Bavaria, Germany, Europe

Forest path through a forest of Common Beeches (Fagus sylvatica) with Bluebells (Hyacinthoides), spring, Hallerbos, Brussels, Belgium, Europe

Gravel beach near the adjacent Nienhaeger Holz nature reserve, also called the 'spook forest', Bad Doberan district, Mecklenburg-Western Pomerania, Germany, Europe

Beeches (Fagus sylvatica) at the steep coast near Nienhagen, deformed by the onshore wind, Bad Doberan district, Mecklenburg-Western Pomerania, Germany, Europe

Forest path through a forest of Common Beeches (Fagus sylvatica) with Bluebells (Hyacinthoides), spring, Hallerbos, Brussels, Belgium, Europe

Winter beech forest, Javorina national wilderness area, Bile Karpaty, White Carpathian Mountains, protected landscape area, Moravia, Czech Republic, Europe

Coast near Nienhagen with the adjacent Nienhaeger Holz nature reserve, also called the 'spook forest', Bad Doberan district, Mecklenburg-Western Pomerania, Germany, Europe

Beech forest in Jasmund National Park, Isle of Ruegen, Mecklenburg-Western Pomerania, Germany, Europe

Aerial view, Diemelsee Nature Park, national park, beech forests, UNESCO World Heritage Site, Willingen Upland, Sauerland, Waldecker Land, Hesse, Germany, Europe

Lady-fern (Athyrium) growing between the moss-covered trunk of an old Beech (Fagus) tree, ancient forest of Sababurg, Hesse, Germany, Europe

Aerial view, Diemelsee Nature Park, national park, beech forests, UNESCO World Heritage Site, Willingen Upland, Sauerland, Waldecker Land, Hesse, Germany, Europe

Stream in a beech forest in autumn in Nonnenfliess Nature Reserve near Eberswalde, Brandenburg, Germany, Europe