Here is a report from 2018 covering a 3-year lookback of bird strikes on helicopters.
The helicopter industry reported 665 bird strikes in the United States over the last three years, according to figures from the Federal Aviation Administration Strike Database.
verticalmag.com
Out of 665 strikes. The 3 fatalities (one crash) seem to be from cockpit penetration of more than one 4+ pound bird and loss of control. Unknown if from pilot incapacitation or jammed controles. Rotors were intact. Other incidents that had injuries (8) were from cockpit penetrations.
Of the 665, 41 (six percent) produced “substantial damage” — defined as damage to an aircraft’s structural integrity, performance, or flight characteristics, normally requiring major repairs or the replacement of the entire affected component. Only 79 strikes [including that 41] (12 percent) resulted in at least some damage.