my brother lives in harriman NY hes got frogs that now live at the pond, and deer that come and drink from it lol and his dogs (labs) that like to jump in it as well, he's never had a problem with birds heating his fish, not yet, knock on wood.
he wound up selling the fry to the local fish store too when they got big enough to be worth anything, koi are funny the colors are hard to judge when they are small and when they grow it all changes, so hard to price out when 3 inches long, and all the dirt from the hole went towards the water fall, that air rates the water, and holds the filtration system.
