[header] How to hatch a mallard duck egg [title] Look for an incubator with a fan. [step] Using an incubator will ensure the egg stays at the right temperature for hatching. You can get a small incubator for eggs with a fan at your local pet store or online. 
[substeps] The incubator should also come with a wet bulb thermometer to allow you to monitor the relative humidity. You can sometimes find used incubators online for a lower price.