How can you tell the gender of a duckling?

You cannot determine a duckling's sex by simply observing its appearance. The most reliable way to identify the sex of a duckling is though a vent sexing technique, which involves gently exposing the vent (the external opening near the tail) to examine its internal organs. This method should only be performed by trained individuals. Ducklings can also be sexed using DNA testing, which requires sending a sample to a laboratory for analysis.