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Jumping spider (Heliophanus sp.) spiderling emerging from entrance to egg sac  and waving mandibles before retreating, Lucerne, Switzerland, July 2019.
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Roman Willi / Jumping spider (Heliophanus sp.) spiderling emerging from entrance to egg sac and waving mandibles before retreating, Lucerne, Switzerland, July 2019.
European hornet (Vespa crabro) feeding on nectar from Arborescent ivy (Hedera helix arborescens) flower, Lucerne, Switzerland, September.
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Roman Willi / European hornet (Vespa crabro) feeding on nectar from Arborescent ivy (Hedera helix arborescens) flower, Lucerne, Switzerland, September.
European hornet (Vespa crabro) feeding on nectar from Arborescent ivy (Hedera helix arborescens) flower, Lucerne, Switzerland, September.
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Roman Willi / European hornet (Vespa crabro) feeding on nectar from Arborescent ivy (Hedera helix arborescens) flower, Lucerne, Switzerland, September.
White-throated dipper (Cinclus cinclus) calling from rock in river whilst looking around, Lucerne, Switzerland, January.
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Roman Willi / White-throated dipper (Cinclus cinclus) calling from rock in river whilst looking around, Lucerne, Switzerland, January.
White-throated dipper (Cinclus cinclus) calling from rock in river whilst looking around, Lucerne, Switzerland, January.
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Roman Willi / White-throated dipper (Cinclus cinclus) calling from rock in river whilst looking around, Lucerne, Switzerland, January.
White-throated dipper (Cinclus cinclus) preening whilst standing on rock in river, Lucerne, Switzerland, January.
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Roman Willi / White-throated dipper (Cinclus cinclus) preening whilst standing on rock in river, Lucerne, Switzerland, January.
White-throated dipper (Cinclus cinclus) perching on rock in river and defecating, before diving beneath water, Lucerne, Switzerland, January.
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Roman Willi / White-throated dipper (Cinclus cinclus) perching on rock in river and defecating, before diving beneath water, Lucerne, Switzerland, January.
White-throated dipper (Cinclus cinclus) engaging in courtship display as another dipper perches on rock and dives beneath water. Mallards swim in river behind, Lucerne, Switzerland, January.
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Roman Willi / White-throated dipper (Cinclus cinclus) engaging in courtship display as another dipper perches on rock and dives beneath water. Mallards swim in river behind, Lucerne, Switzerland, January.
Fish-eating spider (Nilus sp.) feeding on fish, West Bengal, India, October.
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Ripan Biswas / Fish-eating spider (Nilus sp.) feeding on fish, West Bengal, India, October.
Fer-de-lance (Bothrops asper) juvenile resting on a Heliconia (Heliconia sp.) branch and tasting air with tongue, Osa Peninsula, Costa Rica, November.
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Roman Willi / Fer-de-lance (Bothrops asper) juvenile resting on a Heliconia (Heliconia sp.) branch and tasting air with tongue, Osa Peninsula, Costa Rica, November.
Tracking shot of Allen's coral snake (Micrurus alleni) slithering across forest floor, Osa Peninsula, Costa Rica, January.
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Roman Willi / Tracking shot of Allen's coral snake (Micrurus alleni) slithering across forest floor, Osa Peninsula, Costa Rica, January.
Cat-eyed snake (Leptodeira septentrionalis) swallowing Tree frog (Smilisca sp.), Osa Peninsula, Costa Rica, November.
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Roman Willi / Cat-eyed snake (Leptodeira septentrionalis) swallowing Tree frog (Smilisca sp.), Osa Peninsula, Costa Rica, November.