The Oilbird (Steatornis caripensis) is a bird found in the northern areas of South America. They are nocturnal feeders on the fruits of the Oil Palm and tropical laurels, and are the only nocturnal fruit eating birds in the world. They forage at night, navigating by echolocation in the same way as bats, but with a high-pitched clicking sound audible to humans. During the day the birds rest on cave ledges and leave to find their food at night. Although it forages by sight, the Oilbird is one of only a few birds, and the only nocturnal one, known to navigate by echolocation in sufficiently poor light conditions, using a series of sharp audible clicks for this purpose. It also produces a variety of harsh screams while in its caves. Entering a cave with a light especially provokes these raucous calls; they also may be heard as the birds prepare to emerge from a cave at dusk. (Wiki.)

photo by surfbirds.com

Fruit Bat

Mexican Free-Tailed Bats (National Geographic)

The Pink Fairy Armadillo (Chlamyphorus truncatus) or Pichiciego is the smallest species of armadillo. It is found in central Argentina where it inhabits dry grasslands and sandy plains with thorn bushes and cacti. It is a nocturnal animal. It burrows small holes near ant colonies in dry dirt, and feeds mainly on ants and ant larvae near its burrow. The Pink Fairy Armadillo spends much of its time under the ground as it is a “sand swimmer” similar to the Golden Mole or the Marsupial Mole. They use large front claws to agitate the sand, allowing them to almost swim through the ground like it is water. It is torpedo-shaped and has a shielded head to prevent abrasion from the sand. (Wiki.)

Bat Mid-Flight

The Common Pipistrelle Pipistrellus pipistrellus is a small pipistrelle bat whose very large range extends across most of Europe, North Africa, southwestern Asia, and possibly into Korea. It is one of the most common bat species in the British Isles. It is 3.5-4.5 cm long with a wingspan of 19-25 cm. Its brown fur is variable in tone. The frequencies used by this bat species for echolocation lie between 45-76 kHz, have most energy at 47 kHz and have an average duration of 5.6 ms. (Wiki.)