The beautiful Asian koel (Eudynamys scolopacea) is probably one of the most iconic resident bird species in Shenzhen. Every citizen will easily recognize the bird from its unique call, which some of us would consider a bit annoying while others think attractive. Either way, it is a sound to remember. These birds belong to the cuckoo family and they are relatively large, measuring around 45 cm long. They show a strongly marked sexual dimorphism, meaning males look totally different from females. The males are black with an iridescent blue color while females are light brown with several streaks and spots all over their body, making them attractive to look at. Both males and females have a sharp grey beak and striking red eyes, and astonish us with their constant “ku-oo, ku-oo” calls. An interesting fact about Asian koels is that they are brood parasites, meaning that they replace other species’ eggs with their own in order to be fed and raised by a substitute parent. This may sound horrific, but the truth is that this is actually an important ecological way of maintaining stability of other species’ populations, since they have certain preferences for some crow’s nests. Koels are able to eat whatever the environment has to offer, but as adults they have a certain preference for fruits. They prefer to rest on top of trees so most of the time you can just hear them but are probably unable to see them. So remember to look up high and enjoy the unique beauty this species brings to our beloved Shenzhen. | 