"Hives" is what Grizzly.fi calls the liquidity pools provided to you by other platforms (e.g. Pancakeswap). Via Grizzly.fi you can put your capital/liquidity into the underlying DEXs, where the liquidity is then used to process trades. In turn, you earn a portion of the trading fees. Via daily reinvestment of the returns, you will achieve higher returns than if you invest in the underlying DEX directly.