The official description says players can discover rarer eggs, animals, sizes, and mutations. It does not publish a complete rarity table or exact odds.
Track discoveries without guessing odds
Keep track of the egg and animal labels you actually see. The public source confirms rarity variety, but it gives no named tiers or drop rates. Treat a small personal sample as an observation, not proof of a guaranteed outcome.
Keep size and mutation separate
Sizes and mutations are separate discovery dimensions named by the game. Record each as displayed and compare like with like. The available description does not explain their effects, stacking rules, or value, so avoid calling a specific combination strongest without in-game evidence.
Verification note
This guide is limited to the current public Roblox game description. Exact prices, drop chances, stat formulas, and unlock thresholds are not published there.