Chicken math is how I started with 6 chicks like 2 weeks ago and I now have 18. I already have 14 ducks and just got 2 geese today. I think it's just bird math. bwahaha!
Don't forget about your wild turkey step-birds! (Awesome pics, by the way!) Although better to leave them to themselves. They will destroy a garden and fruit trees in no time.
Love the goslings! What kind are they? Some friends had Toulouse geese that were beautiful and excellent watch "dogs"! Nothing got on that property without loud alarm honks!