Tramea lacerata-flying tandem flight

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Description: English: Black saddlebags in tandem. Herrick Lake Forest Preserve, Illinois, USA 中文：华斜痣蜻 串连飞行。 伊利諾伊州, 美国. Date: Taken on 10 July 2016, 14:44:13. Source: Own work. Author: Peterwchen. Camera location41° 49′ 28.44″ N, 88° 08′ 35.67″ W View all coordinates using: OpenStreetMap 41.824568; -88.143243.