Damn, I stop to post ideas
I explain why I got this idea : it's because I find the hunt idea really great, as it make games differents. After starting 3 games, all ecosystem is differents. I got a lot of hyppo previously. Then oliphants. Now I get none but there is a lot of kangoo on the map (as I never met them before). I really like that all features making the game very differents like that.
So I post another idea about that.
In my current game, I don't need to use more explorers because I've explored all, I am on a little continent with another civ.
Instead of animals, there could be places dependant of the ecosystem where you can loot something (a mechanic near hunt one). But here, it's an explorer work. In these place, explorers get a different % to loot something. Maybe they can be in dangerous place also, who now ? As hunt provide production and food, these place could provide something else. Gold why not ? instead of developing animals building in the city, it could provide some improvements more related to resources they loot, herbs, nuts, seeds, some raritys quartz, ebene, bones, jewel etc. They could meet also some very little tribes, or pygmees, asking for help.
As I'm permanently out of gold, it could be nice to get some little building like that, more related to gold bonus, than science one. +extras on health or food sometimes.
Some new place could spawn also, like animals do. Making explorers an unit I would like to use more. I build only one in my current game, and it was enough ! But I have an army of hunters.