While I was primarily looking at plants in Mandai mangroves, I did also see many animals. The enormous number of egrets and herons feeding on the mudflats at the mouth of Sungei Mandai Besar is hard to miss.
The egrets hung out not only on the Mandai mudflats, but also along the Kranji mudflats on the horizon (see tiny blurry white dots in this photo, sorry lah, I blame the lame lens).
Mud lobster (Thalassina sp.).
Mangrove horseshoe crabs (Carcinoscorpius rotundicauda). I didn't see any in pairs, but then again, I wasn't looking for them. I basically came across these animals as I was watching my step to avoid stomping on animals or plants.
Face-banded crab (Perisesarma sp.).
Black-mouthed nerite (Dostia cornucopia).
Red-mouth nerite (Dostia violacea).
Onch slug (Family Onchidiidae)?
Mangrove shield bugs (Calliphara nobilis).
Field Guide to the Butterflies of Singapore, I'm guessing it's some kind of Sailor.
Long-tailed macaque (Maca fascicularis) which disappeared into the trees before I could take a photo of it.
I saw this shelter set up in the mangroves.