To view the spawn volumes.
-Open/load theisland
-Go to Windows/Levels
-Double click on PersistentGameplaySublevel_DinoSpawns
All of the spawns will now load into the Scene Outliner. Each spawn uses a specific DinoSpawnsEntries** BP. For example, the spawn at Mountain Spawns/NPCZoneManagerBlueprint_Land_133 uses DinoSpawnEntriesMountain (Which can spawn 1-2 Rex’s). You can then open up the BP to view which dinos and how many will be able to spawn.
If you just want to check some out, search in the Content Browser for DinoSpawnsEntries and you can see the ones that they are using. Hope this helps.