This is the behaviour the Salt River herd is genuinely famous for, and it is not normal horse behaviour.

These horses feed in the river. They wade in chest-deep and put their heads completely under the surface to pull up submerged aquatic vegetation, locally called eelgrass, and they hold their heads under for several seconds at a time to do it. Photographs of a horse with its entire head below water strike people as impossible the first time they see one. No other free-roaming horse population in North America is known for feeding this way.

It matters most in summer. When desert heat burns off the upland grasses and the forage above the bank stops being worth the walk, the river is still producing. A herd that can eat underwater has a food source that doesn't fail in July. That is very likely a large part of why this particular population persists where it does, at the density it does, within sight of a metropolitan area of nearly five million people.

So the river isn't the scenic element in this picture. It's the reason the picture exists at all: it's drinking water, air conditioning, the summer pantry and the social space, and the horses structure their day around moving to it and away from it.

On printing this one: water and wet coats give you specular highlights that matte surfaces flatten out, which is the strongest case in this whole gallery for metal over paper. The splash detail and the reflection are the reward here, and they're exactly what a soft surface loses first.