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There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word: ibis'

Add an apostrophe s ('s) after the existing s at the end of the word: ibis's

Examples:

This ibis' nest has three eggs.

This ibis's next has three eggs.

Note: If you are a student, use the form that is preferred by your teacher.

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11y ago

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