Recognising mallard x pacific black duck hybrids
Came across this great article that includes an appendix with photos of several hybrid features, scaling them 1-6. 1-2 Being genetically pure Pacific Black Ducks, 3-5 hybrids and 6 being mallards. Features include facial markings, speculum features and leg colour. Can't seem to access the article via Notornis anymore so link to the facebook group's files.
https://www.birdsnz.org.nz/wp-content/uploads/2021/12/Williams_66_45-63.pdf
https://www.facebook.com/groups/mallardstasmania/files
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