My 6 ducks are around 7-8 weeks old and moved them to their outside pen yesterday. I have a concern and that is, the ducks did not go into their house at all yesterday or last night. It got fairly cool last night 35 degrees and I had a heat lamp inside the house with a lower wattage 60W. When I went to check on them this morning before light they were huddled by the pen door but seemed content and not cold. Is there something I need to do to show them it is okay to go into their new house or will they eventually figure it out.