Martin Dohrn / Hippo (Hippopotamus amphibius) in threat pose, Masai Mara, Kenya. Image taken at night using thermal camera technology without artificial lighting.
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Edwin Giesbers / Arctic tern (Sterna paradisaea) in flight, vocalising, aggresive behaviour, Farne Islands, Northumberland, UK, June
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Nick Garbutt / Male Panther Chameleon (Furcifer pardalis) in aggresive posture, displaying at its own reflection in a mirror. Masoala National Park, north east Madagascar.
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Tony Heald / Lappet faced vulture {Torgos tracheliotus} being attacked by an aggresive Black backed jackal {Canis mesomelas} Etosha NP, Namibia
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Edwin Giesbers / Sumatran tiger (Panthera tigris sumatrae) walking, and baring teeth in aggresive display, captive
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Alex Mustard / A pod of male Bottlenose dolphins (Tursiops truncatus) rape a female Atlantic spotted dolphin (Stenella frontalis). Sandy Ridge, Little Bahama Bank. Bahamas.
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Nick Garbutt / RF- Male Panther Chameleon (Furcifer pardalis) in aggresive posture. Captive, from Ambanja region, North West Madagascar. (This image may be licensed either as rights managed or royalty free.)
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Nick Garbutt / Male Panther Chameleon (Furcifer pardalis) head portrait in aggresive posture. Captive and from Masoala National Park, north east Madagascar.
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Nick Garbutt / Male Panther Chameleon (Furcifer pardalis) head portrait in aggresive posture, with one foot raised, Captive and from Masoala National Park, north east Madagascar.
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Nick Garbutt / Male Panther Chameleon (Furcifer pardalis) head portrait in aggresive posture. Captive and from Masoala National Park, north east Madagascar.
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Nick Garbutt / Adult Dog-toothed cat snake (Boiga cynodon) in aggresive posture at night. Danum Valley, Sabah, Borneo, Malaysia
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Bruno D'Amicis / Helmethead gecko (Gekonia chazaliae) portrait with mouth open in aggresive display, Endemic of the Atlantic Sahara, Southern Morocco, NW Africa
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Charlie Hamilton James / Common kingfisher {Alcedo atthis} female (left) being aggresive to youngster, encouraging it to disperse, England
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Richard Du Toit / Hippo bull charging in water {Hippopotamus amphibius} Moremi Res. Botswana, Africa
