I just received 11 TSQ Welsh Harlequin ducklings from Holderread today. I've read that Welsh Harlequins can be sexed by their bill color for up to 2-3 days with about 75% accuracy. I wanted to see how true this is for my birds, so I took photos and wanted to get other people's opinions. I was going to mark them, as the distinction will fade and I will have trouble keeping track of who's who. I was thinking of using washi tape (patterned masking tape) - figured I could get it off easy and I can change it out as they grow. Not sure how it will hold up to water ... Other ideas?
Please let me know if you think I have any of these wrong or how accurate you have found the bill color difference to be. (Also, please excuse the nail dirt, I had been planting blueberry bushes ...)
Duckling #1 - Male?
Duckling #2 - male
Duckling #3 - male
Duckling #4 - female
Duckling #5 - male
Duckling #6 - male?
Duckling #7 - female
Duckling #8 - female
Duckling #9 - female
Duckling #10 - female
Duckling #11 - male?
Thanks for any help!
Please let me know if you think I have any of these wrong or how accurate you have found the bill color difference to be. (Also, please excuse the nail dirt, I had been planting blueberry bushes ...)
Duckling #1 - Male?

Duckling #2 - male

Duckling #3 - male

Duckling #4 - female

Duckling #5 - male

Duckling #6 - male?

Duckling #7 - female

Duckling #8 - female

Duckling #9 - female

Duckling #10 - female

Duckling #11 - male?

Thanks for any help!