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This is two separate ant nest that have merged and formed a supercolony. The nest on the left is just under 5 feet tall and the other is about 4 feet tall. Together their diameter is about 13 feet. Also their nest continues underground to about 4 feet - pretty impressive by any nest standards. They typically build their nest close to or next to fir trees so they can easily gather the needles for nest building. Ant runs radiate from the nest in all directions and over time these runs become like miniature game trails - easily spotted. Just don't be standing in it when it's active.
Spotted in a wooded area in Federal Way, WA.
Spotted on Sep 4, 2017
Submitted on Sep 24, 2017