Magpie - sick or moulting?

Magpie - sick or moulting?

Observation - Magpie - sick or moulting? - UK and Ireland. Description: Many magpies round here seem to have small, misshapen heads. Is it sickness or are they just moulting?

Many magpies round here seem to have small, misshapen heads. Is it sickness or are they just moulting?