A Guess: The + in 50+ might stand for sub-species

On streams I saw taiga and thundra rocks which probably means game will have these two biomes. Taiga biome have pretty nice selection of animals like wolverine, moose, raindeer etc. I guess at least one of those animals could be in the game. Also I saw an icon for what it looked like desert biome. Could bactrian camels represent that biome?
 
I bet that when the game is through being supported with new content and DLC, theres going to be well over 100 species of animals.
 
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