Auricle can mean two things... part of the heart, or the movable part of the ear. In this case, I think that the ear meaning is more likely... and the reason that animal's ears move is so that they can direct their hearing in certain directions to listen for predators or pay attention to something without moving the rest of their bodies and giving away their hiding place.
The auricles increases the volume of the atrium, and yes, they are movable.
The auricles increases the volume of the atrium, and yes, they are movable.
The auricles increases the volume of the atrium, and yes, they are movable.
The auricles increases the volume of the atrium, and yes, they are movable.
Auricles (external ears) in bats are movable and designed to capture sound waves.
The ear-like structures that extend from the atria are the Auricles.
they are the auricles
Auricles
Auricles
quackgrass
Macrotia
The heart.