Cotton is the pied. Summer is the blue.
Here are some pics in natural light.
Yes I drove an hour to see a Avian Vet and certified wildlife rehabilitator.
He showed me how Summers feet were turning blue. He did a thorough exam and looked in their nostrils and told me the sex of each one.
Here is the info on the Vet:Robert Dahlhausen, DVM
Dr. Robert Dahlhausen received his doctorate from The Ohio State University in 1983. Dr. Dahlhausen has practiced avian and exotic animal medicine for over 30 years, opening the Avian and Exotic Animal Medical Center in Cincinnati, Ohio in 1992. Bob lectures locally and nationally, and he has also served as a veterinary consultant for the US Department of Agriculture and the Animal and Plant Health Inspection Service since 1990. He is the founder of Research Associates Laboratory, Inc., now known as Veterinary Molecular Diagnostics, Inc., which practiced the first commercial application of molecular diagnostic methods in veterinary medicine. Infectious avian disease is a field of special interest for Dr. Dahlhausen and he has studied proventricular dilatation disease (PDD) in his practice and laboratory. In 2008, he was named the T.J. Lafeber Avian Practitioner of the Year.
I can say that in the first picture Cotton's cere looks quite white but in the second it looks very pink.
A pinkish/purple translucent cere would indicate a male bird.
You will have to determine what color the cere actually is in person.
On the other hand, Summer's cere is quite chalky white which is definitely a female.
The feet and legs have nothing to do with determining whether or not a budgie is a male or female.
Coloration of the feet and legs
is dependent only on the bird's mutation.
I would have to respectfully disagree with the information Dr. Dahlhausen gave you.
While it's understandable the difficulty in determining the gender on male recessive pied budgies where the "common" rule doesn't apply to them upon reaching maturity, the cere on females is the same regardless of colour mutations and your Summer is showing the typical colours for a female who is currently out of breeding condition.
Again, gender is not determined by the colour on the feet. Pied and Ino budgies of both genders will have pink feet while all others will have the bluish/greyish coloured feet.
If your Cotton's cere has a uniform pinkish colour and during the time you have had him, you haven't noticed any definite changes on cere colour and he is currently an adult, then it's safe to assume that Cotton is a male.
RIP sweet Tito (Summer 2008 - January 17th 2013).
You are missed and never will be forgotten.
I agree, Cotton really is a little boy and Summer is, without a doubt, a little girl
Budgies are one of the few parrot species that are sexually dimorphic, meaning that you can tell males and females apart. The only way this can be done is by looking at their cere. Any other colouration, be it of the body, eyes, or feet, is dependent on the mutation and not in any way related to the gender Aluz and FaeryBee have already given great advice
and Princess Mallorn!
Thank you to Deb for her wonderful Faery magic
It's quite worrying that a specialized avian vet with all those credentials and years of practice can make that error, especially when your little lady is very obviously a little lady. I get asked daily on my Instragram page to help sex peoples birds, but it's usually pet shop assistants who get it wrong!
Either way, gorgeous birds!!