Alex Mustard / Looking down at the top of a submerged reef covered in corals (Acropora spp. and Pocillopora sp.), Fathers Reef, Lolobau Island, Papua New Guinea. Bismark Sea, Pacific Ocean.

Alex Mustard / Close up showing the colours and textures of the curling arms of a Crinoid on a coral reef, Anilao, Batangas marine protected area, Luzon, Philippines, Pacific Ocean.

Alex Mustard / Orange painted frogfish (Antennarius pictus) resting between the venemous spines of a Fire urchin (Asthenosoma varium), Batangas marine protected area, Luzon, Philippines. Verde Island Passages, Pacif...

Alex Mustard / Coleman shrimps (Periclimenes colemani) pair, female on right, camouflaged in their Fire urchin (Asthenosoma varium) home, Batangas marine protected area, Luzon, Philippines. Verde Island Passages, Pa...

Alex Mustard / Saddleback anemonefish (Amphiprion polymnus) and a Spotted porcelain crab (Neopetrolisthes maculatus) living together in an anemone. Bitung, North Sulawesi, Indonesia, Lembeh Strait, Molucca Sea.

Alex Mustard / Pygmy seahorse (Hippocampus bargibanti) among a Sea fan (Muricella sp.) on a coral reef, Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Bernard Castelein / Green-veined white butterfly (Pieris napi) resting on Purple loosestrife (Lythrum salicaria), Brasschaat, Belgium. August.

Bernard Castelein / Speckled bush cricket (Leptophyes punctatissima) resting on leaf, Brasschaat, Belgium. August.

Bernard Castelein / Nursery web spider (Pisaura mirabilis) on web guarding spiderlings, Brasschaat, Belgium. August.

Bernard Castelein / Nursery web spider (Pisaura mirabilis) on web guarding spiderlings, Brasschaat, Belgium. August.

Bernard Castelein / Grayling butterfly (Coenonympha pamphilus) resting on St. John's wort (Hypericum perforatum) seedheads, Klein Schietveld, Brasschaat, Belgium. August.

Bernard Castelein / Raft spider (Dolomedes fimbriatus) resting on Tansy flowers (Tanacetum vulgare), Klein Schietveld, Brasschaat, Belgium. August.