The Nel'Vari Farm Animal shop is not enclosed in a building, it is basically a counter and several pens in the central area of Nel'Vari. This merchant doesn't just sell the Nel'Vari barn animals, but barn permits for the player to build their Elven Barn as well.
One day, long ago, a Nel'Varian enchanter looked at a bush and said 'Hey, that kind of looks like a ram'. The rest is history. These cuddly ram bushes produce berries.
Wayward bovine sometimes found themselves wandering into the Elven forest, in search of pastures to graze in. The mana there manipulated them in... odd ways. Now, they produce mushrooms!
Phoenixes are beautiful and legendary creatures, though they take thousands of years to mature! In the meantime, they often scavenge fire runes for their keepers.
Nel'Varians have lived in tandem with their forest foxes for countless generations. Many of them can be tamed, their sensitive noses capable of detecting buried earth runes.
It's like a... fish... imp... frog... thing? Whatever it is, they're friendly farm companions and love to dive to the depths of pools in search of water runes.