Basically a map, in some corner of the app that could be expanded. and each time the user chose a diferent dino it would highlight the area by probability of spawning.
For example: blue highlighted area: Common spawn
Green highlighted area: Frequent spawn.
yellow highlighted area: casual spawn.
red highlighted area: rare spawn
grey highlighted area: extremely rare spawn
Basically the red and grey are for creatures like the sheep on the island. while blue and green for parasaurs or phiomias.
something simple and not overwhelming, no need for going into every simple biome, or every simple 5 foundations in the map to get the exact%, an estimate by knowledge that could be updated on the long run by the user experience (If that would be acceptable, dododex is strong by having the users being able to give feedback into the app. like the comment sections about taming and encountering.