Mountain biome. T he mountain biome is harsh. The higher you climb the harsher it becomes due to the thinner atmosphere, high winds, and low temperatures. The type of flora and fauna change from the bottom to the top as the climate changes and the soil thins. ne common trait among the mountain biome fauna is that most of them are plant eaters. Such as the yak, mountain goat, the takin, ibex, chinchillas.