David Woodfall / Bird hide, created by Birdwatch Ireland to study and monitor Little tern (Sterna albifrons) colony, indicator species of climate change. County Wicklow, Republic of Ireland. June.
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David Woodfall / Two little tern (Sterna albifrons), one with sand eel landing at the nest amongst Black Oats growing on shell rich sands Machair , Indicator bird of climate change because of its dependence on sand ee...
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David Woodfall / Little tern (Sterna albifrons ) with newly hatched chick, feeding sand eel-Hyperoplus spp.Indicator of climate change as Little terns are only able to feed in top layer of sea water , and as sea warms...
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Dong Lei / Yellow-rumped honeyguide (Indicator xanthonotus) on honeycomb, Yarlung Zangbo Grand Canyon National Park, Tibet, October.
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Ann & Steve Toon / Greater honeyguide (Indicator indicator) at water. Zimanga private game reserve, South Africa. September.
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Roland Seitre / Black-throated honeyguide (Indicator indicator) Fathala Reserve, Senegal.
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Roland Seitre / Black-throated honeyguide (Indicator indicator) Fathala Reserve, Senegal.
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Roland Seitre / Black-throated honeyguide (Indicator indicator) Fathala Reserve, Senegal.
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Roland Seitre / Black-throated honeyguide (Indicator indicator) Fathala Reserve, Senegal.
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Roland Seitre / Black-throated honeyguide (Indicator indicator) feeding on honey comb, Makasutu forest, Banjul, Gambia.
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Roland Seitre / Black-throated honeyguide (Indicator indicator) feeding on honey comb, Makasutu forest, Banjul, Gambia.
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Roland Seitre / Black-throated honeyguide (Indicator indicator) feeding on honey comb, Makasutu forest, Banjul, Gambia.
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Christophe Courteau / Nest of Greater Honeyguide bird (Indicator indicator) hanging in tree, Okvango, Botswana
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Christophe Courteau / Nest of Greater Honeyguide bird (Indicator indicator) hanging in tree, Okvango Delta, Botswana
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Christophe Courteau / Nest of Greater Honeyguide bird (Indicator indicator) hanging in tree, Okvango, Botswana
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Chien Lee / Malaysian Honeyguide (Indicator archipelagicus) female, Sarawak, Borneo, Malaysia
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Michael Durham / Chocolate Labrador Retriever (Canis familiaris) named CJ, indicating he has located a bat roosting site in old ponderosa snag, Coconino National Forest, Arizona
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Michael Durham / Chocolate Labrador Retriever (Canis familiaris) named CJ, sitting to indicate he has located a bat roosting site, Coconino National Forest, Arizona
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Tui De Roy / Kakapo (Strigops habroptilus) biologist climbing tree to count unripe seeds which will be an indicator whether the kakapo will breed this year, Codfish Island, Southland, New Zealand
