If your on mobile and can’t find one of these guys start the tame equus pursuit and walk or fly around the island and eventually a arrow will show up on the top left of your screen. If you follow that then you will find an equus or two. Upvoote if you found this helpful.
Put this higher !!So if you play mobile I found 3 in the same spot okay so first do the volcano pursuit the one where it's the cave inside the pursuit should be south of the equator and in that general area if you look around you'll find them
You can find them at the river in beside griffin mountain. Also they are at the river near the green obelisk. Near water in plains is traditionally where I find them. If you want to find it go to these areas and listen for it’s neigh. Thank you. -Agent Lorelai (The Night Assasin)