Capercaillie mating 'lek' at Balmoral Castle

Now, the capercaillie lek is one of nature's wonders and for the first time, the endangered birds can be seen up close and personal on Balmoral Estate.
A new, virtual attraction allows visitors to see their elusive mating ritual where males square up to one another to prove they are worthy of a mate.

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Had no idea about their plight. Thank you