Dietmar Nill / Particoloured bat roosting {Vespertilio murinus} Germany

Roland Seitre / Lesser Egyptian jerboa (Jaculus jaculus) jumping, Plzen Zoo. Captive.

Roland Seitre / Arabian jird (Meriones arimalius) head portrait, Plzen Zoo. Captive.

Roland Seitre / Nubian ibex (Capra nubiana) head portrait, Los Angeles Zoo, California. Captive.

Roland Seitre / Heaney's bushy-tailed cloud rat (Crateromys heaneyi) head portrait, Praha Zoo. Captive.

Roland Seitre / Matthey's mouse (Mus mattheyi) portrait, Plzen Zoo. Captive.

Roland Seitre / Tree rat (Thallomys sp.) sitting on branch looking down, Praha Zoo. Captive.

Roland Seitre / Four Spinifex hopping mice (Notomys alexis) infants, playing, Adelaide Zoo. Captive.

Roland Seitre / Merriam's kangaroo rat (Dipodomys merriami) Plzen Zoo. Captive.

Joel Sartore / Photo Ark / Afro Australian fur seal (Arctocephalus pusillus) with mouth open, head portrait, Faunia Zoo, Madrid, Spain. Captive.

Joel Sartore / Photo Ark / Close up of female Eastern red bat (Lasiurus borealis) face, calling, in Florida, USA. Captivity.

Joel Sartore / Photo Ark / Close up of Long-haired fruit bat (Rousettus lanosus) landing at Lincoln Children's Zoo, Nebraska, USA. Captivity.

Joel Sartore / Photo Ark / Sulawesi stripe-faced fruit bat (Styloctenium wallacei) flying at Plzen Zoo, Czech Republic. Captivity.