1: Male hummingbirds have vibrant colors and flashy throat patches, while females are more subdued.

2: Size can also indicate gender, with males typically being smaller and slimmer than females.

3: Check for a straight or slightly curved bill on a hummingbird to determine the sex.

4: Males often have longer tail feathers than females, which can help in identification.

5: Female hummingbirds are usually larger and plumper to support egg-laying activities.

6: Pay attention to their behavior - males are more territorial and aggressive towards other males.

7: Look for differences in color patterns on the head and body of the hummingbirds.

8: Listen for distinctive vocalizations from the males, which they use to attract mates.

9: Observing mating displays can also give clues to distinguish between male and female hummingbirds.