The Scottish Parliament are due to vote for the final time on the Scottish Equal Marriage Bill later today.
In November last year MSPs backed the bill at it's first stage with 98 votes to 15, with 5 abstentions.
Some religious groups are opposed, but ministers said it was the right thing to do.
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The population of the bird in the south of Scotland has fallen dramatically in the past decade, due to overgrazing and habitat loss.
Vigils have been held in the region to mark the 100th anniversary of the battle of the Somme.
Vigils will take place across the region tonight to remember those who fought in the Battle of the Somme 100 years ago.