Wow! A tiny little package! We ordered 20 Welsh Harlequin Ducks, and they sent 2 extras. We ordered from www.Holderreadfarm.com David Holderread wrote Storey's Guide to Raising Ducks. They all seem healthy and alert after a 36 hour trip from Oregon to Texas!
Our reference to nail polish - we used Honeybee Gardens water based non-toxic polish. We dabbed a little spot on the right foot of the ducklings we presume are males. They have the darker bills. (But it did not stay on- it had come off in just a few hours- now how can we mark them, and they stay marked?!?)