Useful links
UK based
Legal Status
RSPB legal status - mallards Wildlife and Countryside Act 1981 Wild birds: licence to remove abandoned or unsuccessful eggs (GL12) Mallard ducks: licence to take eggs and rear and release chicks (GL13)
Expert Rehabilitators
RSPCA find a rehabilitator Wildlife Rescue Advice:- helpwildlife.co.uk Wild birds: UK Animal Rescuers British Wildlife Rehabilitation Council
General
Mallards
RSPB Mallard main page RSPB - Nesting mallards Poultrykeeper.com - How to care for wild ducks