Just such a project is [Radomir Dopieralski’s] set of wearable mechatronic cat ears. A cosplay accessory ... instead he’s using an accelerometer to detect head movement coupled to an Arduino ...

Gracie, a seven-year-old white cat, had to have her ear flaps amputated ... She learnt to compensate for the lack of outer ears by moving her head more to better locate sounds.

Flattened ears are a cue that the cat is feeling fearful and irritated Ears twisted to the back of the head may suggest that the cat is feeling aggressive Perked, erect ears show that a cat is ...