Dichotomous Key Practice Part I: Dichotomous Keys Using Smiley Faces



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Dichotomous Key Practice

Part I: Dichotomous Keys Using Smiley Faces

Look at the first Smiley Face. Starting at question 1, use the dichotomous key to identify the Smiley Face. As you work through, record the steps you took to identify the Smiley Face. Remember that for each Smiley Face, you will always start with question 1 to begin the identification process. No name will be used twice; each Smiley Face has its own unique name.



1a. Teeth visible…….. go to 2

1b. Teeth not visible…….go to 4


2a. Has a wide, toothy smile…… Smilus toothyus

2b. Is not smiling…… go to 3


3a. Visibly crying…… Smilus dramaticus

3b. Frowning……Smilus upsettus


4a. Eyes are symmetrical …… go to 5

4b. Eyes are not symmetrical ……go to 8


5a. Eyes shaped like hearts …… Smilus valentinus

5b. Eyes shaped as ovals …… go to 6
6a. Smiling, happy face …… Smilus traditionalis

6b. Not happy, frowning or other …… go to 7


7a. Mouth curved down, frowning …… Smilus saddus

7b. Mouth is a small circle …… Smilus suprisus


8a. Has a pirate eye patch …… Smilus piratus

8b. Does not have eye patch …… go to 9


9a. One eye is much larger than the other eye …… Smilus mutates

9b. One eye is winking …… Smilus winkus





Smiley Face 1

Steps Taken

Smiley Face 2

Steps Taken

Smiley Face 3

Steps Taken

Name of Smiley Face 1:






Name of Smiley Face 2:






Name of Smiley Face 3:






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