To make a dichotomous key, start by making 2 groups, for example big cats with spots versus big cats without spots. Then, subdivide each of these groups into 2 more groups, like big cats with short tails, big cats with long tails, and big cats with no tails. Akeyusedtoidentifyaplant!or!animal!in!whicheach stage!presentsdescriptionsof!two!distinguishing!
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- Some specimens will be differentiated before the end, as you work through your contrasting characteristics. For instance, you might find yourself looking at some birds, and some reptiles. You will break them down into these groups, then sub-divide the birds.
- Two of the birds swim, but one of them does not. The single land bird will be identified as such, but you will have to further differentiate the swimming birds.
- In this case, you notice that one of the swimming birds is ocean-going, and one is not. This characteristic can allow you to identify them more precisely (e.g., as a gull and a duck).