You can view how many hives have died in an particular yard in the app. You can also see which hives died and their history.

You can go to a yard page either by searching for a specific yard (A) or simply by clicking on a yard card (B).
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Select the Deadout tab to see the specific hives that died inside that yard.

Once on the deadout tab, you will see the complete list of hives that died in that yard. Then click on whichever hive you want to see its details.
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On the deadout page, you can view the date at which the hive was marked as dead and other informations.

You can also click on the activity tab to view the history of the hive before it was marked as a deadout.