We are looking to get some ducks for garden/yard bug control and would love some that are calmer with kids too (4 & 6 pet savy kids). We also don't have a natural water source so we will be creating one for them. I'm thinking a small flock of 4ish ducks. I've been looking at Runners and Blue Sweedish and Pekin. Any suggestions on what would be best for our needs?