> For the complete documentation index, see [llms.txt](https://docs.hoppersgame.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hoppersgame.io/about/hoppers-game/breeding-mechanics.md).
# Breeding Mechanics
### Overview
Breeding is a specific sort of adventure that does not yield any $FLY from staking. Instead, based on your Hoppers' Fertility attribute, there is a chance for your staked Hopper to return a Tadpole.
Breeding in Hoppers game requires only 1 of your Hoppers to be staked.
Sending your Hopper into the Breeding area requires $FLY, which is burned.
Tadpoles are able to be collected on day one but are very rare for low-level Hoppers, regardless of your fertility attribute. For that reason, it is highly recommended to level your Hopper prior to directly entering the breeding area.
The maximum chance to spawn a tadpole is 90% at 10 Fertility and Level 100.
A hopper with Fertility of 4 and Level 12 will have a spawn chance of 21%
Tadpoles are NFTs and can be traded.
* There are two different drop rates to keep track of:
* The spawn chance of a tadpole is based on fertility and level.
* If spawned, the rarity level of each tadpole is based on a different probability, in the following table.
| Rarity Level | Chance |
|---|
| Common | 50% |
| Rare | 30% |
| Exceptional | 15% |
| Epic | 4.6% |
| Legendary | 0.4% |
Tadpoles will lead to the next stage of Hoppers Game.
The cost to send your Hopper to breed is 250 $FLY.
You can not un-stake your Hopper from a breeding adventure for 24 hours.
### Contracts
Breeding: [0x711233d6AAd35b14750F65f9CF413fa748149345](https://snowtrace.io/address/0x711233d6AAd35b14750F65f9CF413fa748149345#code)
Tadpole: [0x0e1ce5cd26d67fd416dc6a22eb97d60131d0901b](https://snowtrace.io/address/0x0e1ce5cd26d67fd416dc6a22eb97d60131d0901b)