
The Pearl's Hill City Park sits on a hill [naturally (^^)] that is now surrounded by buildings. On the western side, it is flanked by the Outram Park Housing Estate (this was a prison long ago) and the Outram Park MRT Station (so access is easy). To the south is the Police Quarters and other Police facilities ending with the the CID facing the Eu Tong Sen Street. And on the east is also partly Police facilities with the Pearl's Hill Primary School and the Landmark Condominium.
In the wee morning, you can find younger people running around the park (I used to do that 20 years ago (^^), and the older people practising their "Tai Chi". In the late mornings to afternoon, it is a fairly quiet place, with the occasional children trying to catch some fish from the pond. In the evening, it is a lovers' park. So, in short, this park is pretty well-used.
Interestingly, we can still find a fair bit of birds and butterflies, and there is quite an array of trees, some of which could be more than 40 years old. I hope to be able to gather more information on the flora and fauna and place them here for your reading pleasure. Any contribution is most welcomed.
A flatten hill-top with a regional water storage tank at the summit. It was historically the first (?) site for Tan Tock Seng hospital. I was told it was a swampy area in the 1800s. The vegetation of the park should be categorized as parkland but it is devoided of undergrowth in most area of the park. The steep slope of the park is covered by fringing Acacia and tembusu trees. The park has a fantastic range of tall tembusu trees and ficus spp. It has a unique kapok tree growth behind the police hostel. It also has a tiny "forested" patch near the pond. The pond used to have a huge overgrowth of pandanus but was removed a few years ago. The pandanus was home to a breeding family of waterhens. The aquatic life in the rather small pond is amazing. Fishes in the pond include common gourami, Toman (giant snakehead), Japanese carps, Tiger-barbs, Rasbora, freshwater snails, prawns, and whitespots.
Oriental whip-snake and Common blind snake were sighted here. The only common mammal here is the Plantain squirrel. Bats are common here.
Acknowledgement: Nature Society (Singapore)/Terence

Notes: Numbers indicated here are referring to the Numbering in the Field Guide to the Birds of South-East-Asia by Ben King, Martin Woodcock and E.C. Dickinson (in parenthesis).
| King's Chklst | Common Names | Scientific Names |
| Little Heron | Butorides striatus | |
| Yellow Bittern | Ixobrychus sinensis | |
| Oriental Honey-buzzard*1*5 | Pernis ptilorhyncus | |
| Brahminy Kite | Haliastur indus | |
| White-bellied Sea-eagle*1 | Haliaeetus leucogaster | |
| White-breasted waterhen*6 | Amaurornis phoenicurus | |
| Common Sandpiper | Actitus hypoleucos | |
| Pintail Snipe*3 | Gallinago stenura | |
| Pink-necked Pigeon | Treron vernans | |
| Spotted Dove | Streptopelia chinensis | |
| Peaceful Dove | Geopelia striata | |
| Common Koel | Eudynamys scolopaecea | |
| House Swift | Apus affinis | |
| Common Kingfisher | Alcedo atthis | |
| White-throated Kingfisher | Halcyon smyrnensis | |
| Black-capped Kingfisher | Halcyon pileata | |
| Collared Kingfisher | Halcyon chloris | |
| Blue-throated Bee-eater | Merops viridis | |
| Great hornbill*2*7 | Buceros bicornis | |
| Pacific Swallow | Hirundo tahitica | |
| Common Iora | Aegithina tiphia | |
| Red-whiskered Bulbul | Pycononotus jocosus | |
| Yellow-vented Bulbul | Pycononotus goaivier | |
| Black-naped Oriole | Oriolus chinensis | |
| House Crow | Corvus splendens | |
| Black-throated laughingthrush*2 | Garrulx chinensis | |
| Hwamei*2 | Garrulx canorus | |
| White-rumped Shama*2 | Copsychus malabaricus | |
| Common Tailorbird*2 | Orthotomus sutorius | |
| Brown Shrike*2 | Lanius cristatus | |
| Asian Glossy Starling*4 | Aplonis panayensis | |
| Purple-backed Starling | Sturnus sturninus | |
| Common Myna | Acridotheres tristis | |
| White-vented Myna | Acridotheres javanicus | |
| Hill Myna*2 | Gracula religiosa (javana) | |
| Brown-throated Sunbird | Anthreptes malacensis | |
| Purple-throated Sunbird | Nectarnia sperata | |
| Olive-backed Sunbird | Nectarnia jugularis | |
| Scarlet-backed flowerpecker | Dicaeaum cruentatum | |
| Scaly-breasted munia | Lonchura punctulata | |
| Eurasian Tree-sparrow | Passer montanus | |
| Feral pigeon |
Notes
Acknowledgements: This first list is based on Nature Society (Singapore)'s Terence's records from 1993 to 1994

Thanks to Simon Chan, this is the first list of butterflies seen at the Park on Saturday, 16 January 1999.
| Common Names | Scientific Names | |
| Chocolate Pansy | Junonia hedonia ida | |
| Leopard | Phalanta phalanta phalanta | |
| Lemon Emigrant | Catopsilia pomona pomona | |
| Painted Jezebel | Delias hyparete metarete | |
| Chestnut Bob*1 | Iambrix salsala salsala | |
| Common Grass Yellow | Eurema hecabe contubernalis | |
| Great Egg Fly | Hypolimnas bolina bolina | |
| Common Three Ring | Ypthima pandocus corticaria | |
| Mycalesis perseus cepheus | ||
| Common Palmfly | Elymnias hypermnestra agina | |
| Lime Butterfly | Papilio demoleus malayanus | |
| Common Four Ring | Ypthima huebneri | |
| Baron | Euthalia aconthea gurda | |
| Short Banded Sailor | Phaedyma columnella singa | |
| Contiguous Swift*1 | Polytremis lubricans lubricans | |
| Striped Albatross | Appias libythea olferna | |
| Tailed Green Jay | Graphium agamemnon agamemnon | |
| Common Tit | Hypolycaena erylus teatus |
Notes:
Updated 14 March 99