How do you find the nest of a Fork-tailed Drongo (Dicrurus adsimilis)? Close observation and caution are required. Observation, because you will need to watch where the drongos appear from and disappear to, and you will need to listen for the sound of their altercations with other birds. The latter ties in with why you need to exercise caution when looking for the nest of a Fork-tailed Drongo: they are aggressive birds that will defend their nest and young regardless of the shape, size or origin of the perceived intruder – that includes you, the human!
I may have mentioned before that for a couple of breeding seasons in a row, the main path leading towards the administration block of the school I taught at had to be blocked off with danger tape and a sign erected requesting visitors to approach via the library. This is because the drongos, nesting very high up in a jacaranda tree, would dive-bomb unsuspecting visitors innocently walking underneath ‘their’ territory – drawing blood on more than one occasion with their sharp beaks!
Finding the nest of a Fork-tailed Drongo begins with observing their courting behaviour. These birds enjoy a monogamous breeding relationship and so one can be entertained for a while by the wonderful aerobatic displays that involve swooping, diving, and chasing each other – and any interlopers – around the garden, accompanied by a variety of vocal noises. Such activity quietens down once the rivals have been dispensed with and minds focus on close family matters.
I had a fair idea that a pair might be nesting in the Natal Fig – that is where I observed a youngster being fed last summer – but peering up into the branches yielded nothing. The birds would often appear from somewhere in the canopy to hawk insects, to drink from the nectar pub, or to see what was on offer at the feeding tray, and they would disappear in the same direction. It is with good cause that they are frequently described as feisty and fearless birds. My hunch grew stronger when I heard the pair of Fork-tailed Drongos attacking the Knysna Turacos perching in the fig tree … then I saw one of them mobbing a Pied Crow until it was well past the perimeter of several gardens away – its crime had been to fly too low over the fig tree … then late yesterday afternoon both drongos loudly attacked the hapless Hadeda Ibises that have traditionally roosted in the branches of the fig tree for the past two decades at least. Their nest had to be there!
Fork-tailed Drongos build their nests where the branches of a tree form a fork. This provides a steady platform on which they can create their cup-shaped nests out of grass, roots, lichen, tendrils and twigs, all bound together with spider web. As I observed last summer, the eggs appear to be incubated by both parents, both of which certainly take turns feeding their chicks. Armed with this knowledge, I continued to scan the branches to no avail until this morning when I witnessed an altercation between a Fork-tailed Drongo and a Red-eyed Dove – another denizen of the fig tree. After a brief flurry of feathers, all was silent … I looked up once more and was rewarded by the sight of a Drongo sitting on its nest, the tell-tale forked tail hanging over the edge.
Perseverance wins in the end: I have found the Fork-tailed Drongo nest at last – and witnessed the ‘changing of the guard’, as one parent took over from the other!