Not goats, camels.

[Driver]

How can this bactrian dromedary nubian cashmere be in bright sunshine whilst in the shadow of his neighbour as well?

Because of the angle. The angle of the dangle, that is.

And - Arabian camels have one hump, Bactrian camels have two. Some Arabian camels - the lighter ones, originally bred for racing, are referred to as dromedaries. So if we can figure out a way to weigh the lighter images in the photo, we can settle this! ('Way to weigh'? Wa-hay!)

[Cliff Rogers]

How can this bactrian dromedary nubian cashmere be in bright sunshine whilst in the shadow of his neighbour as well?

Look carefully at the shadows, one shadow passes UNDER the belly of the other.
That means the only part of the second 'non-goat' in shadow is its legs & you can't see the legs from directly above.