Question

Bat can travel with
(a)Eyes open
(b)Eyes plugged and ears open
(c)Ears plugged and eyes open
(d)Ears closed and eyes plugged

Answer 1

Hint: Bats have a special ability known as echolocation that helps them to detect their Environment during traveling in the darkness. They can even catch prey only with the help of this ability without seeing the prey.

Complete answer:
Bats travel by plugging their eyes while the ears stay open. Their biosonar system helps them to detect distant objects by making high pitched sounds that produce the echo back from those objects. Due to this echolocation, they respond rapidly to eat and can avoid obstacles and even catch prey. During this time, their eyes stay plugged.

Additional Information: Bats are mammals that can fly due to their special structure of the forelimbs which are adopted as wings. They are more maneuverable than birds and fly with their long spread-out digits which are covered with the thin patagium.
One of their special abilities is to produce Ultrasonic sounds to produce echos. These echos help them to produce clear images of the surrounding which gives them the ability to travel without actually seeing the environment. The cricothyroid muscle orients pulse frequency and are the only muscle capable of aiding phonation. The brain and auditory nervous system work together to compare the outgoing pulse with the returning echoes and give the image of the surroundings to detect, localize, and classify their prey in darkness. The ultrasounds are created by the larynx and get emitted through the mouth and nose. During this whole process, their eyes stay plugged.
Therefore, the answer is “Eyes plugged and ears open”.

Note: Along with bats, many other animal species- some mammals, birds, notably laurasiatheria, some odontocetes, etc can carry out echolocation with the help of their specialized organs. This process is also known as biosonar and it was first observed in bats by an American Zoologist Donald Griffin in 1938.