As far as we know, there is only one Great Hornbill (Buceros bicronis) in Singapore. And this bird is an escapee, probably from the Jurong Bird Park some years ago. For some months now, this bird has paired up with a Rhinoceros Hornbill (B. rhinoceros), another escapee. Two earlier reports (1, 2) give accounts of the activities of these two hornbills prospecting for a nesting cavity in an old albizia tree (Paraserianthes falcataria) around the Eng Neo area. They arrived during most mornings of late February and March 2006, spent half an hour to an hour around the area before leaving. Sometimes they also came during the evenings. Towards late April and May these birds appeared less regularly.

We have always wondered where the birds ended up at night. At last we have part of the answer.

Brian Ng alerted me of a Great Hornbill that regularly arrived every evening around 7.00 to 7.15 pm to spend the night on a branch of a rain tree (Samanea saman) outside his fifth level apartment window around Adam Road. The hornbill stayed all night in this tree but come morning, usually around 6.45 to 7.00 am, it started moving, stretching its wings and preening before flying towards Bukit Timah Nature Reserve. Or that was what Brian thought.

But I think it flew to nearby Eng Neo where it met up with the Rhinoceros Hornbill.

The Great was always alone at the roost. And Brian never saw the presence of the Rhinoceros. Now where can the Rhinoceros be roosting at night?

Towards the end of April onwards the bird visited less regularly, coinciding with its irregular visits to the Eng Neo area. Brian has since confirmed (30th May 2006) that “The Great hasn’t returned… in the past weeks…”

Thanks Brian for the alert. Image by Chan Yoke Meng.

Brian’s video can be viewed here.

The courtship behaviour of a Great (Buceros bicronis) and a Rhinoceros Hornbill (B. rhinoceros), both female, at Eng Neo has already been told. However, through the generosity of Meng and Melinda Chan, we are able to showcase here more of what actually happened around the old albizia tree (Paraserianthes falcataria). The pair would meet in the morning and/or evening and the Great (above right, taking on the role of a male) would always check on the cavity. “He” would then fly back to join the Rhinoceros on a nearby branch and delicately fed the latter with a fig. This is the standard courtship ritual. Possibly, this was to reassure her that “he” would keep on feeding her should she be sealed up in the cavity during egg incubation and after (should this happen). Only then would the Rhinoceros fly off to check the potential nest cavity. In the image below you can see a Greater Racket-tailed Drongo (Dicrurus paradisus) harassing the Rhinoceros. There was always a pair, probably breeding nearby, that followed the hornbills around.
The image on the left shows the Rhinoceros, with her head inside the cavity, checking the interior. The Great is perching on the tree trunk below, waiting for her decision.

The pair has been visiting the tree during February to May, as this is supposed to be the breeding period. There is a report of someone seeing the Rhinoceros entering the cavity, to move out soon after. But there has not been any attempt of the Rhinoceros sealing herself inside the cavity. This would be a distinct possibility, considering that both are females. And a female bird would only enter the cavity and seal herself in after copulation.

Such aberrant behaviour probably arises out of desperation. After all, there is only one of each bird in Singapore, both escapees. And they have come together out of loneliness.

Text by YC, images by Meng and Melinda Chan.

We are used to seeing mynas hovering around grasscutters or even garbage disposal people. But to see one around a horse? Or chasing the horse when it gallops around the course? Well, Leykun had such an experience, as seen in a letter written on 12th April 2006:

“I was at the Saddle Club recently to practise photography.

“The Common Myna ( Acridotheres tristis) was seen hopping, chasing and even flying after the horse (picture above). I think it was the horse’s butt or smell that attracted the bird. It was very purposeful in its actions as it practically chased the horse for several hundred metres until the horse turned a corner and got out of my sight. I am curious to know what the mynah was going after.”

R. Subaraj has this to say: “Possibly flies or some parasite that were on or around the horse. These could be near the rear end of the horse, causing the myna to follow the horse

“The Jungle Myna (Acridotheres fuscus) of Malaysia and northwards was formerly called the Buffalo Myna as it was often found around water buffalos and cows, picking off the ticks and insects on or around the animal. The Javan Myna has also learnt the value of larger domestic animals pushing up grasshoppers and the like from grassy areas and follow them around. In Singapore, Javan (and Common) Mynas can often be found following lawn mowers, picking up the insects stirred up. Other birds like Cattle Egrets (Bubulcus ibis) do it too.”

Thank you Leykun for the interesting story and image; and Subaraj for your comment.

A pair of Collared Kingfishers (Todiramphus chloris) was nesting in a cavity found at the central point of a rotting tree trunk in a small piece of secondary growth at Eng Neo. Most of March 2006 the birds were flying in and out of the nest. Sometimes the arrival would be accompanied by the shrill cries of the bird. At other times the bird would fly in silently.

The hungry nestlings needed to be fed regularly and the parents worked hard bringing them food. There would always be some invertebrates like a centipede or a grasshopper. The birds would stop over at a nearby tree, checking to see whether it was safe to proceed, before flying to the nest. Initially, it entered the cavity to pass on the food but later it just stopped at the entrance. Sometimes both parent birds approached the cavity at the same time. In such cases one would veer off and wait its turn. There had also been a few cases when the morsel brought to the nest was not accepted by the nestlings (see above). In such cases the parent bird flew off to a nearby perch to consume it.

At the upper end of the trunk was another cavity. Here, a pair of Long-tailed Parakeets (Psittacula longicauda) initially took occupancy. The presence of the parakeets nesting above caused no problems to the kingfishers. Both species coexisted peacefully. However, when the hornbills were around the rotting trunk, which was not often, the kingfishers as well as the parakeets were invariably frightened away.

Text by YC; images by Meng and Melinda Chan (Great Hornbill, bottom) and YC (the rest).

April 22nd was Earth Day. It was quite busy for Timothy Pwee in many ways. In the morning around 9.30am, one of the Nature Society (Singapore)’s Education Group volunteers, Hui Ping, spotted an eggshell with a fully developed embryo on the grass in the Palm Valley of the Singapore Botanic Gardens. Together with Goh Si Guim, Tim went to take a look. They found several clusters of light blue eggshell fragments around one of the palms. There was one with a fully developed embryo totally out of the shell.

As Tim narrates: “Because the eggshell had cracks radiating from more than one spot, we suspected that the egg had been attacked rather than just dropped from the nest. Another almost complete shell on the other side of the palm appeared to be around one and a half times larger. This larger eggshell did not have speckling. Wang Luan Keng suggested that this shell belonged to the Black-naped Oriole (Oriolus chinensis).”Si Guim continues: “Besides the shattered egg and the spilled embryo of an incompletely developed bird, there were other empty shells around the tree. All were empty. They could be empty shells ejected from the nest(s) above, meaning that the chick had hatched out and fledge. Or the eggs could have fallen and the content decayed some time ago.

“Please note the markings on these two shells (image above). The one on the right does not have brown specks, suggesting different species of birds nesting among the many woody leaf bases on one palm tree. There were many Asian Glossy Starling (Aplonis panayensis) visiting these palms.

“Would forensic birding reveal how these eggs got onto the ground? Were the eggs cracked by raiders or did they break up on impact with the ground i.e. whether they were ejected by parasitic birds or the nest were raided by other birds.

“In the 90s, while exploring the still untouched Bidadari Cementery (Muslim side), I encountered an oriole raiding the nest of other birds. Egg yolk was seen dripping from the branches. I also had a close encounter with the Changeable Hawk-eagle (Spizaetus cirrhatus), now that I recall those nostalgic moments.”

R. Subaraj has this to say: “We know that crows raid nests of birds and consume the eggs and chicks. However, I have not heard of orioles doing so too! We must not rule out the Plantain Squirrel as being another potential culprit (especially at the Singapore Botanic Gardens). However, we need documentation to prove whether they simply are destructive or if they actually feed on the eggs.

Input by Timothy Pwee and Goh Si Guim, ID by Wang Luan Keng. Top image by Tim, the rest by Si Guim.

You can view Tim’s posting here.