If evolution champions 'survival of the fittest,' why do sloths still exist?

A screenshot of a Reddit comment by user Steve Baker explaining that 'the fittest' in evolutionary biology means 'the best fit for its ecological niche,' not 'the fastest' or 'most ferocious.' The text uses the sloth as an example, noting its slow metabolism and lazy lifestyle allow it to survive on minimal food while more 'exciting' animals starve. The comment is upvoted 87 times and includes a profile picture of Steve Baker.

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