Daniel Heuclin / Vinchuca (Triatoma infestans) walking across human skin. The bug is a blood feeder, and vector of Chagas disease. Controlled conditions. Bolivia, April.

Daniel Heuclin / Mosquito (Anopheles gambiae) feeding on human in controlled conditions. The body is becoming engorged with blood. Malaria vector. Africa, June. Engorging sequence 2 of 3. Model released

Nigel Cattlin / Horse chestnut leaf miner (Cameraria ohridella) larval damage to Horse chestnut (Aesculus hippocastanum) leaves. Berkshire, England, UK. August.

David Perpinan / Snake fungal diseases in a wild Eastern indigo snake (Drymarchon couperi). This is an emerging disease in wild snakes of North America. Small repro only

Emanuele Biggi / Andean frog (Bryophryne cophites) dead from chytrid fungus (Batrachochytrium dendrobatidis) Cusco region, Peru.

Emanuele Biggi / Abra Acanacu marsupial frog (Gastrotheca excubitor) dying due to heart attack caused by Chytrid fungus (Batrachochytrium dendrobatidis) Peru.

Steve O. Taylor (GHF) / Straw-coloured fruit bats (Eidolon helvum), thought to be the natural reservoir of the Ebola virus, for sale in Brazzaville market, Republic of the Congo, 2013.

Adrian Davies / Horse chestnut Leaf Miner Moth (Cameraria ohridella) Larva extracted from leaf. Surrey, UK. Approx 5mm long

Adrian Davies / Horse Chestnut Leaf Miner Moth (Cameraria ohridella) larva in leaf (centre of frame) Surrey, UK July

Mark Bowler / Yellow fever mosquito (Aedes aegypti) a mosquito that can spread dengue fever, chikungunya, and yellow fever viruses, and other diseases.

Alex Hyde / Horse Chestnut leaves (Aesculus hippocastanum) infected with Leaf Miner Moth (Cameraria ohridella) on a white background. Peak District National Park, Derbyshire, UK. July. This insect is an invasive...

Will Burrard-Lucas / Domestic dogs near hut, domestic dogs can transmit rabies and other diseases to Ethiopian Wolf (Canis simensis) Bale Mountains National Park, Ethiopia.