 The wren (Troglodytes troglodytes) is a very active small bird, weighing around 00g - about half an ounce. This male has been building this nest for some weeks, however it will be one of several he builds in an attempt to woo a female. This one has chosen the build under the front overhang of a boat roof. Heron 0 This heron (Ardea cinerea) was later rewarded for its patience with a rather unfortunate pike (Esox lucius). The heron's simple technique is wait, then stab its beak through its prey skewer style. Heron and pike Nature in the raw. This heron (Ardea cinerea) was rewarded for its patience with this rather unfortunate pike (Esox lucius). The heron's simple technique is wait, then stab its beak through its prey skewer style. Heron and pike 