All dino's are female. But like Malcom said, life will find a way. Why not a genome modification that allows dino's to be born as male. Name it for example gender change and start with 1.0. for 10% chance. Than after research 2.0 for 20% en 3.0 for 30% chance. Than let male and female produce an egg once in a while. Pay and use rangers to keer the eggs healthy . Let the baby dino's grow untill they are mature so you can sell them or keep them. This gives a total new dimention to the game, particularly the sandbox.