Biology — Dichotomous Key: Vertebrates

A branching key to the five vertebrate classes.

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digraph VertebrateKey {
  rankdir=TB;
  node [shape=box, style=rounded];
  Q1 [label="Feathers?"];
  Q2 [label="Fur or hair?"];
  Q3 [label="Moist scaleless skin?"];
  Q4 [label="Dry scales, lays eggs on land?"];
  Birds; Mammals; Amphibians; Reptiles; Fish;
  Q1 -> Birds [label="yes"];
  Q1 -> Q2 [label="no"];
  Q2 -> Mammals [label="yes"];
  Q2 -> Q3 [label="no"];
  Q3 -> Amphibians [label="yes"];
  Q3 -> Q4 [label="no"];
  Q4 -> Reptiles [label="yes"];
  Q4 -> Fish [label="no (gills, fins)"];
}