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Cathedral Rock at the intersection of upper Baldwin Loop and HiLine Trails with sign warning that the HiLine Trail is for experts only, Sedona, Arizona, United States of America, North America

Yaquina Head lighthouse, the tallest of Oregon's nine surviving 19th century lighthouses, Oregon, United States of America, North America

A warning sign near the cliffs at Beachy Head on the south coast, South Downs National Park, East Sussex, England, United Kingdom, Europe

Magellanic penguin (Spheniscus magellanicus) calling, giving a warning call, Patagonia, Chile, South America

Ardnamurchan Lighthouse, at the westernmost point of the British mainland, west coast, Scotland, United Kingdom, Europe

Nudibranch, Jorunna funebris, feeding on blue sponge, Haliclona sp., Monkey beach, Puerto Galera, Mindoro, Philippines.

Polycerid nudibranch, Nembrotha cristata, external gill detail, Puerto Galera, Mindoro, Philippines..

The Environmental Restoration Disposal Facility (ERDF), a low level waste facility at Hanford Nuclear Site, WA. The trucks are carrying mostly soil but also some misc. equipment taken from the decommissioning work at Hanford.

A Road And Trees Covered With Deep Snow And A Yellow Sign Saying Dead End, Alaska, United States Of America

Floor marker as a reminder for physical distancing during the Covid-19 world pandemic; Edmonton, Alberta, Canada

Elephants warning sign on a roadside, on the road to Brandberg Mountain, Damaraland; Kunene Region, Namibia

Sea Stack, Dun Briste, in the water along the West coast of Ireland, Downpatrick Head, Wild Atlantic Way, Killala, County Mayo, Ireland

Agriculture - Obliquebanded leafroller (Choristoneura rosaceana) insect trap placed in a cherry orchard in Spring. Its function is an early-warning system to detect adult insect emergence and monitor pest populations so that timely control programs can be

Lioness and cub (Panthera Leo) face camera near Impala (Aepyceros melampus) harem, Grumeti Serengeti Tent Camp, Serengeti National Park; Tanzania

Male lion (Panthera leo) stalks Masai giraffe (Giraffa camelopardalis tippelskirchii) in savannah, Serengeti, Tanzania

A Collared Pika (Ochotona collaris) sounds an alarm to nearby Pikas to alert them to a possible danger or to simply communicate with others. Pikas do not hibernate and are actually small members of the rabbit family. Hatcher Pass area near Palmer, Alaska in South-central Alaska, late summer; Alaska, United States of America

Printed signs to caution against handshaking during the Covid-19 world pandemic; Edmonton, Alberta, Canada

Caution sign at Kolugljufur Gorge, a canyon with a spectacular waterfall in Northwest Iceland; Hunaping vestra, Northwestern Region, Iceland

Agriculture - An insect trap placed in a Thompson Seedless grape vineyard in Spring. Its function is an early-warning system to detect adult insect emergence and flight of certain moths including the European Grapevine Moth (Lobesia botrana) and the Omniv

Cautionary Road Sign Of Bear Crossing On A Windy Mountain Road With Vehicle On Roadway, With Mountains And Blue Sky, Waterton, Alberta, Canada

Sign On An Old White Picket Fence Saying Posted Keep Out No Trespassing, Monterey Bay, California, United States Of America

Bear warning sign posted on a closed gate where a trail has been closed, Liard River Hot Springs Provincial Park, British Columbia, Canada

Bear Proof Trash Can At Totem Trail, Sitka National Historical Park, Sitka, Alaska, United States Of America

A Sign Warning A Danger And Sudden Drops Along The Atlantic Coastline, Calvert, Newfoundland And Labrador, Canada