LYNN M. STONE / RF - Standard schnauzer in spring vegetation. Branford, Connecticut, USA. (This image may be licensed either as rights managed or royalty free.)
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Charlie Summers / Greater Prairie Chicken (Tympanuchus cupido) cock, portrait with pinnate feathers raised, eyebrows gourged and neck sack extended, Colorado, USA
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Peter Cairns / European Eagle Owl (Bubo bubo) in heather. Captive. Scotland, UK, March.
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Anup Shah / Gelada baboon (Theropithecus gelada) infant aged 9-12 months suckling while its mother warns an unseen threat by flashing her eyebrows, Simien Mountains National Park, Ethiopia, November
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Fiona Rogers / Gelada baboon (Theropithecus gelada) mature male flashing eyebrows as a sign of aggression, Simien Mountains National Park, Ethiopia, November
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Fiona Rogers / Gelada baboon (Theropithecus gelada) female showing aggression by flashing eyebrows, Simien Mountains National Park, Ethiopia, November
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Fiona Rogers / Gelada baboon (Theropithecus gelada) females showing aggression, one lip flipping, Simien Mountains National Park, Ethiopia, November
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Fiona Rogers / Gelada baboon (Theropithecus gelada) juvenile showing displeasure by flashing eyebrows, Simien Mountains National Park, Ethiopia, November
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Fiona Rogers / Gelada baboon (Theropithecus gelada) female and infant both warning others by flashing eyebrows, Simien Mountains National Park, Ethiopia, November
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Fiona Rogers / Gelada baboon (Theropithecus gelada) female flashing eyebrows and lip flipping to show aggression, Simien Mountains National Park, Ethiopia, November
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Tony Phelps / Chacoan horned frog {Ceratophrys cranwelli} South America
