We raised our 6 chicks last March in our house. I used an old toddler exercise pen (plastic octagon shaped contraption) that we had used to house our small dog as a puppy when we weren't home and I plan on using it again when we get ducklings. I draped in a tarp and used bungee cords to secure it to the pen frame. When we first got the chicks home, I configured the pen to be smaller in a square and then when they were bigger I stretched it to its full size in a rectangular shape.
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I ended up putting bird netting over the entire thing when the chicks got older because they could easily jump on the waterer or feeder and fly over the sides.
I plan on doing the same thing when we get ducklings. However, I plan to incorporate straw more than the shavings we used with the chicks. It was very very very dusty. The entire causeway area that housed their pen was covered in dust and after I dusted and vacuumed, the dust returned in a day.
We used the heating pad/mama pad for our six chicks and it worked great! I'm going to try it again with the ducklings. I'm not too keen on having heat lamps perched and on all hours. Our six chickies would go under the pad since I had it secured to a cookie drying rack. If they got too hot, they would be halfway under or they'd go on top. I also eventually put the setting on the lowest setting and then when I noticed they weren't really using it, I took it out. I figured they were old enough by then.
We moved ours out after 6 weeks of being inside. At that point, they were about 7 weeks old since we got them when they were 3-5 days old from Tractor Supply. They were pretty feathered in by then and it was the beginning of May so it was warming up outside.
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Best of luck to you! BYC is amazing. I've gotten so much help, support, and ideas on here. Enjoy those chickies too! They grow up so quick. I miss those little chirps every day and can't wait to hear some little sounds from our ducklings.