Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) searching for clams on tidal flats followed by opportunistic gulls, Lake Clark National Park, Alaska

Tui De Roy / Brown Noddy (Anous stolidus), opportunistically chasing fish escaping diving Brown Pelicans (Pelecanus occidentalis) Itabaca Channel, Santa Cruz Island, Ecuador

Tui De Roy / Brown Noddy (Anous stolidus), opportunistically chasing fish escaping diving Brown Pelicans (Pelecanus occidentalis) Itabaca Channel, Santa Cruz Island, Ecuador

Nick Upton / Herring gulls (Larus argentatus) foraging in a flock in shallow sea water near shore for invertebrates disturbed from tide wrack by a high spring tide, Looe, Cornwall, UK, June.

Nick Upton / Herring gull (Larus argentatus) standing on car roof in a car park waiting to scavenge food dropped by tourists, Looe, Cornwall, UK, August.

Nick Upton / Herring gull (Larus argentatus) landing among a flock foraging near shore for invertebrates disturbed from tide wrack by a high spring tide, Looe, Cornwall, UK, June.

Nick Upton / Herring gull (Larus argentatus) landing among a flock foraging near shore for invertebrates disturbed from tide wrack by a high spring tide, Looe, Cornwall, UK, June.

Graham Eaton / Cattle Egrets (Bubulcus ibis) scavenging on a rubbish tip, Luanda, Angola, February.

Paul Harcourt Davies / Bee orchid (Ophrys apifera) showing opportunistic spider on web alongside flower ready to trap insect visitors, Italy

GEORGETTE DOUWMA / Dash-and-dot goatfish (Parupeneus barberinus) grubbing in sand, closely watched by a Spinecheek (Scolopsis sp., an undescribed species) hoping to catch escaping prey. Bali, Indonesia

GEORGETTE DOUWMA / Dash-and-dot goatfish (Parupeneus barberinus) grubbing in sand for prey, closely watched by Longbarbel goatfish (Parupeneus macronema) and a Twoline spinecheek (Scolopsis bilineatus) hoping to catch e...

GEORGETTE DOUWMA / Peacock / argus wrasse (Halichoeres argus) following a foraging goatfish (parupeneus sp) about. Bunaken National Park, North Sulawesi, Indonesia