From the USGS National Wildlife Health Center Bulletin:

“The global level of HPAI virus detections in wild birds as we begin winter 2020/2021 is similar to the winter of 2014/2015, when HPAI was detected in North American wild birds and heavily impacted domestic fowl. Elevated
vigilance for morbidity or mortality events in wild birds is therefore recommended, as investigating wild bird mortality events enhances the opportunity for early detection of HPAI, improves situational awareness, and enables a more effective management response, should an outbreak occur.”