# What is a Cardinal Animal?

This is in the spirit of the What is a Word™/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.

If the name of an animal conforms to a special rule, I call it a Cardinal Animal™.
Use the examples below to find the rule.

$$\begin{array}{|c|c|}\hline \bbox[yellow]{\textbf{Cardinal Animals }^™}& \bbox[yellow]{\textbf{Not Cardinal Animals }^™}\\ \hline \text{ EAGLE}&\text{GOOSE}\\ \hline \text{ GIRAFFE}&\text{CARIBOU}\\ \hline \text{ MONITOR LIZARD}&\text{GENTOO PENGUIN}\\ \hline \text{ FALCON}&\text{TURKEY}\\ \hline \text{ DUCK }&\text{COOT}\\ \hline \text{ HEDGEHOG}&\text{PLATYPUS}\\ \hline \text{ CAT}&\text{DOG}\\ \hline \end{array}$$

CSV Version:

EAGLE,GOOSE
GIRAFFE,CARIBOU
MONITOR LIZARD,GENTOO PENGUIN
FALCON,TURKEY
DUCK,COOT
HEDGEHOG,PLATYPUS
CAT,DOG


The puzzle relies on the series' inbuilt assumption, that each word can be tested for whether it is a Cardinal Animal™ without relying on the other words.

These are not the only examples of Cardinal Animals™, many more exist.

Hint:

The pairing across each row tells you something about one half of the pattern