Part of the Yucatan fauna (3)

I believe the answer is:

cat

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'fauna' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'part of the yucatan' is the wordplay.
'part of' indicates a hidden word.
'CAT' can be found hidden inside 'yucatan'.

Can you help me to learn more?

(Other definitions for cat that I've seen before include "Tiger, for instance" , "Feline mammel" , "Eg, tiger, lion" , "Animal; converter; boat" , "An old whip with nine tails" .)

I've seen this clue in the Evening Standard.

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