It may be an inaccurate picture.

Sleeping time had previously been measured using captive sloths which, the researchers now realise, gave an inaccurate picture of their wakefulness in the wild.

The findings have been challenged, however, by healthcare workers who say that the report paints an inaccurate picture of care and services.

However, nearly all of these studies have relied solely on culture-based methods, which may provide an inaccurate picture of what the most abundant or important nitrogen-fixers actually are.