Swans/wetlands add on

I think swans would be such an amazing addition to the wetlands biome. The player should be able to even bond a pair and then those two swans are inseparable. There can be variants: white, black, even grey swans. A food source like watercress would be a great bonding food like seeds are to chickens. The addition of swans could come with reeds, cattails, even a new weeping willow tree if you really wanted to get aesthetic with it.