| azerbaijan | | anas crecca crecca | subspecies | 37 | 0 |
| canada | quebec | anas crecca | species | 0 | 1 |
| china | | anas crecca | species | 1 | 0 |
| china | heilongjiang | anas crecca | species | 0 | 1 |
| china | henan | anas crecca | species | 0 | 1 |
| china | hunan | anas crecca | species | 0 | 1 |
| egypt | | anas crecca | species | 16 | 0 |
| guatemala | | anas crecca | species | 12 | 0 |
| hong kong | | anas crecca | species | 3 | 0 |
| india | | anas crecca | species | 100 | 0 |
| iran | khuzestan province | anas crecca | species | 0 | 1 |
| iraq | | anas crecca | species | 1 | 0 |
| iraq | saladin governorate | anas crecca | species | 1 | 0 |
| italy | | anas crecca crecca | subspecies | 70 | 0 |
| italy | veneto region | anas crecca | species | 20 | 0 |
| japan | tottori prefecture | anas crecca | species | 16 | 0 |
| mexico | chihuahua | anas crecca | species | 0 | 1 |
| mongolia | khovd province | anas crecca crecca | subspecies | 21 | 0 |
| netherlands | | anas crecca | species | 40 | 0 |
| norway | | anas crecca | species | 2 | 0 |
| poland | podlasie province | anas crecca | species | 0 | 1 |
| russia | arkhangelsk oblast | anas crecca crecca | subspecies | 88 | 0 |
| russia | chukotka autonomous okrug | anas crecca crecca | subspecies | 21 | 0 |
| russia | khabarovsk krai | anas crecca crecca | subspecies | 46 | 0 |
| russia | magadan oblast | anas crecca crecca | subspecies | 66 | 0 |
| russia | primorsky krai | anas crecca | species | 0 | 1 |
| russia | primorsky krai | anas crecca crecca | subspecies | 80 | 0 |
| russia | sakha republic | anas crecca crecca | subspecies | 42 | 0 |
| russia | tyumen oblast | anas crecca crecca | subspecies | 26 | 0 |
| russia | volgograd oblast | anas crecca | species | 0 | 1 |
| russia | yamalo-nenets autonomous okrug | anas crecca | species | 2 | 0 |
| russia | yamalo-nenets autonomous okrug | anas crecca crecca | subspecies | 42 | 0 |
| saudi arabia | eastern province region | anas crecca | species | 0 | 1 |
| south korea | | anas crecca | species | 65 | 0 |
| sweden | uppsala | anas crecca | species | 1 | 0 |
| sweden | vasterbotten | anas crecca | species | 1 | 0 |
| switzerland | graubunden region | anas crecca crecca | subspecies | 373 | 0 |
| taiwan | | anas crecca | species | 0 | 1 |
| ukraine | kherson oblast | anas crecca | species | 0 | 1 |
| united kingdom | wales | anas crecca | species | 0 | 1 |
| united states | | anas crecca | species | 288 | 0 |
| united states | alaska | anas crecca | species | 635 | 2 |
| united states | alaska | anas crecca crecca | subspecies | 3 | 0 |
| united states | delaware | anas crecca | species | 0 | 1 |
| united states | florida | anas crecca | species | 0 | 1 |
| united states | georgia | anas crecca | species | 0 | 1 |
| united states | north carolina | anas crecca crecca | subspecies | 6 | 0 |
| united states | oklahoma | anas crecca | species | 0 | 1 |
| united states | texas | anas crecca | species | 0 | 4 |