Nichelings should, now that they have wings, be able to have Feathers and now that they have scorpion tails, other arthropod appendages should be able to get in
Let me start with this
Avian Genes
Feathered Body
+1 flying with wings
+2 cold resistance
+2 heat resistance
-2 stealth
Feather crest(in horn slot)
+1 attractiveness
+distasteful appearance
Clawed wings
+1 digging
+3 flight if genes are identical