Inaki Relanzon / Lesser Horseshoe Bat (Rinolophus hipposideros) hibernating in Forat de l'Or cave in Terradets Canyon, Pyrenees, Lleida, Catalonia, Spain, December

Jussi Murtosaari / Daubenton's bat (Myotis daubentonii) hunting a mosquito. central Finland, June.

Eric Medard / Bats (Microchiroptera) in flight under bridge, taken at night with infra red remote camera trap, Mayenne, Pays de Loire, France, August.

Paul Harcourt Davies,Paul Harcourt Davies / Lesser Horseshoe Bat (Rhinolophus hipposideros) hibernating in an Etruscan tomb, Podere Montecucco, near Orvieto, Umbria, Italy, November

Gabriel Rojo / Fisherman bat (Noctilio leporinus),Cuiabá River,Pantanal, Mato Grosso, Brazil

Karine Aigner / Woman with arms in air enjoying emergence of millions of Mexican free-tailed bats (Tadarida brasiliensis) at dusk. Bracken Bat Cave, San Antonio, Texas. June 2016.

Melvin Grey / Yellow-winged bat (Lavia frons) roosting. Bogoria, Kenya.

Melvin Grey / Bechstein's bat (Myotis bechsteinii) resting with open mouth. West Wales, UK.

Adrian Davies / Leaf-nosed bat (Phyllostomidae sp) nectaring on Banana (Musa sp) flower. Costa Rica. Digital composite.

Felis Images / Schneider's leaf nosed bat (Hipposideros speoris) in flight in cave. Andhra Pradesh, India. Photo Anjani Kumar/Felis Images

Felis Images / Schneider's leaf nosed bat (Hipposideros speoris), two flying in cave. Andhra Pradesh, India. Photo Anjani Kumar/Felis Images

David Woodfall / Lesser horseshoe bat (Rhinolophus hipposideros) in magnesium mine, Shropshire, England, UK, April.