Nour:

You could use same method (see link) as used for humans:

Best

Syed

In mammals, including Muridae, the ear is measured from the edge of the cartilage (not counting the end of the wool) to the lower part of the so-called groove of the ear cartilage, which is located near the Darwinian hump.

With best regards, Ihor

Dear Nour Shari, the ears of mammals are somewhat different from humans. Therefore, measurements also have their own peculiarities.

With best regards, Ihor

Ihor:

Agreed that Mammals would have different shape and sizes in different ecological niches. Therefore, is there a simple method to measure the dimensions of the Ear with their peculiarities? This is what Nour is asking.

Best

Syed

Dear, Syed.

I gave an example of a standard ear measurement in mammals. I assume that he will be the simplest. Thank you. Sincerely, Ihor