A Dichotomous Key to Alien Creatures:

$1.$ Head

a$.$ The creature has a large wide head $-$ go to $2$

b$.$ The creature has a small narrow head $$ go to $11$

$2.$ Eyes

a$.$ It has $3$ eyes $-$ go to $3$

b$.$ It has $2$ eyes $-$ go to $7$

$3.$ Chest

a$.$ There is a star in the middle of its chest $$ go to $4$

b$.$ There is no star in the middle of its chest $-$ go to $6$

$4.$ Hair

a$.$ The creature has hair spikes $-$ Broadus hairus

b$.$ The creature has no hair spikes $-$ go to $5$

$5.$ Bottom

a$.$ The bottom of the creature is arch$-$shaped$-$ Broadus archus

b$.$ The bottom of the creature is M$-$shaped $-$ Broadus emmus

$6.$ Bottom Shape

a$.$ The creature has an arch$-$shaped bottom $-$ Broadus plainus

b$.$ The creature has an M$-$shaped bottom $-$ Broadus tritops

$7.$ Spikes

a$.$ The creature has hairy spikes $-$ go to $8$

b$.$ The creature has no spikes $-$ go to $10$

$8.$ Star

a$.$ There is a star in the middle of its body $-$ Broadus hairystarus

b$.$ The is no star in the middle of its body $-$ go to $9$

$9.$ Shaped Bottom

a$.$ The creature has an arch shaped bottom $-$ Broadus hairyemmus

b$.$ The creature has an M shaped bottom $-$ Broadus kiferus

$10.$ Body Symmetry

a$.$ The body is symmetrical $-$ Broadus walter

b$.$ The body is not symmetrical $-$ Broadus Anderson

$11.$ Antennae

a$.$ The creature has no antennae $-$ go to $12$

b$.$ The creature has antennae $-$ go to $14$

$12.$ Face

a$.$ There are spikes on the face $-$ Narrowus wolfus

b$.$ There are no spikes on the face $-$ go to $13$

$13.$ Spikes

a$.$ The creature has no spike anywhere $-$ Narrowus blankus

b$.$ There are spikes on the right leg $-$ Narrowus starboardus

$4$