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I visited Malaysia in 2004 for 5 days, spent an after in Kuala Lumpur in 2008 and a couple of nights in Taman Negara in 2010.
Taman Negara, 3 nights in 2004 - White-thighed Langurs (during the boat trip in and also from the Kumbang hide), Low’s, Plantain and Prevosts Squirrels, Common Porcupine, Yellow-throated Martens, Pencil-tailed Tree Rats (aka Sundaic Arboreal Niviventer) (Niviventer cremoriventer), Intermediate Roundleaf bats, Lesser Sheathtails, Lesser False Vampire Bats, Lesser Mouse Deer, Black Giant Squirrels, Black Flying Squirrels, Colugo.
In 2010 during 2 nights I saw at least one Tapir, a few Dusky Langurs and some Plantain Squirrels.
Bukit Fraser, 1 night in 2004 - Siamang, White-thighed Langurs and a Himalayan Striped-tree Squirrel.
Bukit Larut (Maxwell Hill), 1 night in 2004 - Wild Boar, Crab-eating Mongoose, Masked Palm Civet, Common Palm Civet, Highlands Niviventer (Mountain Rat) (Niventer cameroni split from N. rapit ).
Kuala Selanagor, 1 hour in 2004 - Silvered Langurs and Long-tailed Macaques.
My more Detailed Trip Reports
Taman Negara 2010: 2 nights and at least one Tapir.
Other People's Trip Reports
Indonesia & Malaysia, 2011: Romain Bocquier, 6 weeks & 43 species including Marbled Cat and Sulawesi Dwarf Cuscus.
Borneo and Malaysia, 2011: Indri Tours, 11 days & 33 species including Banded Palm Civet, Malayan Weasel and Western Tarsiers (twice).
South East Asia, 2010: Matt and Maureen Steer, 8 weeks & 31 species including Hairy-nosed Otters, Gaur and Pangolin (Thailand), Short-clawed Otters (Malaysia) and Smooth-coated Otters (Singapore).
Greater Sundas (West Malaysia, Borneo, Sumatra, Java): Tim Mitzen, 2 months and 55 mammals. A full trip report is here.
Peninsular Malaysia and Sabah: Francine Mejia, 2007 & 2008.
Peninsula Malaysia, 2006: Steve Anyon-Smith, 1 week & 21 mammals.
Peninsula Malaysia and Sarawak, 1998: Steve Anyon-Smith, 4 weeks & 29 mammals.
Peninsula Malaysia, 1997: Susan Myers, 3 weeks and 16 species.