2.1 Example 2
Here is another real world example for you to consider.
Example 2 Damselflies – identifying different species
To help us differentiate further, here are videos of male and female demoiselle damselflies:
Download this video clip.Video player: Video 3
Transcript: Video 3 A female demoiselle damselfly.
[BIRDS CHIRPING]
Video 3 A female demoiselle damselfly.
Interactive feature not available in single page view (see it in standard view).
Download this video clip.Video player: Video 4
Video 4 A male demoiselle damselfly.
Interactive feature not available in single page view (see it in standard view).
Are these green and blue insects one species or two? The truth is that they are just one species: the banded demoiselle damselfly (Calopteryx splendens).
To make identification even more confusing, a few species such as the scarce blue-tailed damselfly (Ischnura pumilio) not only have males and females of somewhat different colour, but also the females change colour markedly during their life from the beautiful orange shown in Video 5 to a green-brown colour scheme.
Download this video clip.Video player: Video 5
Video 5 A blue-tailed damselfly (Ischnura pumilio).
Interactive feature not available in single page view (see it in standard view).