Ummm.... I can identify individuals amongst my sheep from their voices. Not all of them, but some of them.
Sadie has a completely different sound to any other sheep on the farm, including Buffy, who came with her.
There's a deep (and loud!) timbre to the call of some of our Beltex- and Texel-out-of-Mule sheep that identifies them as being ones sourced from the moorland farm. The only other sheep we have that sound similar came from another moorland farm
On the whole, our Texels are extremely quiet. They call their lambs when necessary and they call out to each other when the feed is arriving. Some of them call us to tell us it's time the feed was arriving
. But compared to the Swaledales and Mules on the moorland farm, they are practically mute!
And the Mules here are a lot more vocal than the Texels too.