. Wren 0 The wren (Troglodytes troglodytes) is a very active small bird, weighing around 00g - about half an ounce. This one has chosen to build under the front overhang of a boat roof. Wren 0 The wren (Troglodytes troglodytes) is a very active small bird, weighing around 00g - about half an ounce. This one has chosen to build under the front overhang of a boat roof. Wren 0 The wren (Troglodytes troglodytes) is a very active small bird, weighing around 00g - about half an ounce. This one has chosen to build under the front overhang of a boat roof. Wren 