A fact from Northern brown howler appeared on Wikipedia's Main Page in the Did you know column on 15 March 2021 (check views). The text of the entry was as follows:
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The following is an archived discussion of the DYK nomination of the article below. Please do not modify this page. Subsequent comments should be made on the appropriate discussion page (such as this nomination's talk page, the article's talk page or Wikipedia talk:Did you know), unless there is consensus to re-open the discussion at this page. No further edits should be made to this page.
... that no more than 50 mature individuals of the "critically endangered" northern brown howler are estimated to remain? Source: "The remaining population size is unknown, but it is suspected to number not more than 250 individuals, with no more than 50 mature individuals, sparsely distributed in diminished forest fragments."