Chris Mattison / Yellow poison dart frog (Phyllobates terribilis) the world's most poisonous amphibian captive from northern South America.

Dr. Axel Gebauer / Bacteria - iron and manganese oxidizers and their complementary reducers, in the mud of an empty fish pond, Upper Lusatia Heath and Pond Landscape, Upper Lusatia UNESCO Biosphere Reserve, Germany

Alex Hyde / Aposematism describes the use of bright colouration and bold patterns to advertise that an organism is unpalatable or dangerous. All three insects are foul-tasting or toxic if eaten: Wood Tiger moth...

Nigel Cattlin / Hemlock water dropwort (Oenanthe crocata) umbel, Chesil Beach, Dorset, England, UK. May.

Nigel Cattlin / Hemlock water dropwort (Oenanthe crocata) flowers against blue sky. Chesil Beach, Dorset, England, UK. May.

Nigel Cattlin / Hemlock water dropwort (Oenanthe crocata) flower heads. Growing beside canal, Berkshire, England, UK. June.

Nigel Cattlin / Hemlock water dropwort (Oenanthe crocata) flower head. Growing beside canal, Berkshire, England, UK. June.

Nick Garbutt / A cluster of fragrant orchids (Gymnadenia conopsea) in ancient alpine meadow. Nordtirol, Austrian Alps, Austria, June.

Nick Upton / Cinnabar moth (Tyria jacobaeae) caterpillar feeding on Ragwort (Jacobaea vulgaris) in meadow. Wiltshire, England, UK. July.

Jack Dykinga / Burrowing owl (Athene cunicularia) female feeding Colorado river toad (Incilius alvarius) to chick. In evening light, Marana, Arizona, USA. May.

Nick Upton / Devil's apple (Solanum linnaeanum) with toxic fruit. Invasive species, native to South Africa. Sardinia, Italy. June.

Nigel Cattlin / Bird cherry-oat aphid (Rhopalosiphum padi) infestation on Wheat (Triticum aestivum) leaf with Barley yellow dwarf virus (BYDV) symptoms present.