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& Photos by Gloria Seow, Education Committee Vice-Chairperson
A light rain
drummed steadily as we gathered on 18 June 2017. Still, we were hopeful of
seeing some of Sungei Buloh Wetland Reserve’s herptiles, given the sharp eyes
of our guides the Law brothers Ing Sind and Ingg Thong. They are passionate
about herptiles (reptiles and amphibians), and belong to the Herpetological
Society of Singapore.
But first, Auntie Gloria presented a crowd
pleaser – a colony of Lesser Dog-faced Fruit Bats (Cynopterus brachyotis)
roosting under the roof of the Visitor Centre. For many, it was their first
encounter with an upside down wild bat trying to catch some sleep. This bat
shows sexual dimorphism – males have a rufous
collar while females lack
this. It can be readily seen flying around housing
estates to feed on fruiting trees in the late evenings.
At the main
bridge, we spotted our first herptile – a young 2-m long Saltwater Crocodile (Crocodylus porosus) spread out in full
glory on the river bank. This raised the excitement level by several notches as
we took turns peering through the scope. Ingg Thong remarked that young crocs
are pale yellow in colour with black stripes and spots, while adults are
uniformly brown or grey. Little Emmanuel then found us a White-breasted
Waterhen (Amaurornis phoenicurus)
foraging by the mud banks.
Our guide Ingg Thong pointing out a half-submerged Malayan Water Monitor.
Next, we
stopped at the Main Hide to gaze out at the wetlands. Few birds were around as
it was not yet the migratory season. Nevertheless, we heard the raucous cry of
the Collared Kingfisher (Todiramphus
chloris) as it flew by, and had fleeting glimpses of the Black-naped Oriole
(Oriolus chinensis) up in a tree.
Despite
the steady drizzle, we pressed on. While Ing Sind went ahead as spotter, Ingg
Thong engaged the children with his wealth of knowledge. Pointing at a Macaranga sapling, Ingg Thong remarked
that it has a symbiotic relationship with biting Kerengga ants (Oecophylla smaragdina). The ants make
themselves at home in the hollow of the stem and will attack any intruders,
hence protecting their host from herbivores. They are in turn rewarded with
secretions of nectar. Kids were fascinated to see live examples of this ant-plant
symbiosis.
Ingg
Thong introduced the Sea Holly (Acanthus
ebracteatus), a mangrove shrub with leaves that resemble the festive Christmas
Holly. Mangrove plants are adapted to the changing salinity of tidal brackish
waters, by extruding salt crystals in their leaves. He drew attention to a Fishtail
Palm (Caryota mitis) with a prominent
cluster of drooping fruits. When touched, the fruits can cause a terrible itch due
to oxalic acid – a prank that children used to play on their teachers by
coating surfaces with them. He commented that the plant’s jagged leaves look half-eaten,
deterring animals from making a meal of them.
The Malayan Water Monitor is the second largest lizard in the world after the
Komodo Dragon.
At the
freshwater pond, we found a lone Red-eared Slider (Trachemys scripta elegans) swimming forlornly. This invasive herptile
(in this case a turtle) originates from the US. As a popular pet, the slider is
sometimes abandoned by owners when it grows big and is no longer cute, and is hence
common in waterbodies around Singapore. The pond also held several Malayan
Water Monitors (Varanus salvator),
another herptile. We observed them swimming languidly around and clambering onto
shore. The monitor is the second largest lizard in the world after the Komodo
Dragon. Sometimes, it exceeds the dragon in length but is not as heavy. It is
often mistaken for a crocodile when half submerged.
We spotted a total of four Saltwater Crocodiles in one
morning.
We
completed the loop around Buloh to end at the main bridge. Here, we were elated
to pick out three submerged crocodiles with only their snouts and eyes visible.
A contact told us that he had seen six crocodiles the day before. A
recently-discovered crocodile at Pasir Ris beach is likely from Malaysia as the
Causeway forms a physical barrier between Sungei Buloh and Pasir Ris. The growing
number of crocodiles indicate that Singapore’s watery habitats are in good
health.
1 comment:
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