We have 2 plain old mixed ducks (females, no longer laying), and I've always loved the way runners run around, so I want to get a couple this year. We have 2 fenced in acres, and a GP, plus 3 other dogs that watch the property, so they can free range. Are runners any different than waddling ducks? Any special needs? Please excuse my ignorance, just looking for input. Thanks in advance!