There are a few extra special creatures found throughout the South and Mexico in Red Dead Redemption's Undead Nightmare, aside from the zombie dogs, cats and bears - oh my! These Mythological Creatures can be hard to find, but thanks to us, you’ll have some fancy new heads mounted on your imaginary wall in no time.
Just a note that the animals that aren’t story related will have a blue marker appear when they're near, except for the Unicorn. You’ll need to track that one down the good old fashioned way, by using your eyeballs. Also, some of the Horses of the Apocalypse can be found in multiple areas at different times of day, so the ones listed are where they were wrangled and during what time frame. So, without further ado, let the hunt begin!
Location: Tall Trees
Near the beginning of the game, there will be a survivor’s mission available in Tall Tree’s called “The Birth of the Conservation Movement”. Here you will need to take down some... Sasquatch? Sasquatches? Sasquatchi? Anyway, you need to take a few of them down and you can return to the snowy lands of Tall Trees anytime afterwards to find them again. When you bag your first Bigfoot, you’ll get the Six Years in the Making achievement/trophy.
NOTE: The Chupacabra can only be encountered once the player has reached the Undead Hunter Rank 5 Challenge.
Location: Randomly spawns in the Nuevo Paraiso territories
The Chupacabra is a grey beast that looks similar to a boar. If you look on the map, there are three horses near the town of Torquemada. The creature will show up around there, sometimes further south, but always in the general area. Once it appears, it will bolt and you will have to give chase. It’s a quick little bugger so make sure you set after it as soon as you see it. It doesn’t take much to bring it down, as a few rifle shots will do the trick. It will also nab you the Chupathingy achievement/trophy.
Location: Around Torquemada and Diez Coronas after the Chupacabra has been killed and the Four Horses of the Apocalypse Challenges have been completed.
The Unicorn can only be found once the Legendary level has been reached in the hunting challenge - which consists of finding and killing the Chupacabra. To find the Unicorn, simply go to the same place the Chupracabra was, near Torquemada and the three horses on the map. For me, the Unicorn didn’t appear until I had all of the challenges completed and the achievement/trophy popped. Unlike every other creature, there is no warning blue circle that it is near, so you need to keep an eye open and look for it the old fashioned way. Once you get ahold of the butterfly spouting horse, you’ll also get the Fan Service achievement/trophy.