Bad anatomy
This app's anatomy is quite bad at leaset for musculature. For instances, caudofemoralis runs medially to the pelvis; quadrate fomoris originates from the pelvis; iliofibularis is missing, all of which are incorrect in birds.
Good visual reference
Only reason for 4 stars is it uses mammalian naming conventions for the muscles instead of avian/reptilian - so the names of the muscles may not match up with a lot of other reference and will require a bit of translation on your own.
Great app!
Just bought all nine of the apps this company makes for anatomy. That's how good I think they are. Easy to use and thorough and nothing like it for the price!!
