I have a red sex link and a cuckoo that raised chicks that were not theirs!!!
Red sex link raised 7 guineas & still has them trailing after her now even with them being bigger than her, they sleep lined up on roosting pole, run around yard together and if get out of her sight they panic! It is so funny!! Prior to setting on eggs, she would take eggs to her nesting area under her wing one by one so she wanted to be a mommy!!
Now for my cuckoo, she has hatched eggs previously that were not hers and is a wonderful mom!! She sits, takes care of chick, protects, feeds and then kicks them away and on their on as it should be!! The summer of 2017 she hatched one banner silver seabright which is no fault of hers that eggs were not fertile!! She is a wonderful mom!! Very protective !!
Good luck with hatching and chicks!!
TCorum