this thread's been rolling along so I thought I'd throw in my two cents worth. One thing to bear in mind is that most languages have more or less stable vowel sounds (unlike English which has multiple sounds for each vowel). If you know the vowel sounds you can pronounce the word properly. And particular languages have specific but non-obvious ways of pronouncing certain consonants, or ways of adding or dropping syllables that aren't always clear to an English speaker (Malagasy being a particularly nasty one for things like that

). And don't even get me started on tonal languages like Thai!! Furthermore, turning the foreign word into an English one often mangles the 'proper' pronunciation. Then there's the matter of different accents (eg, North American, South African, Australian) to confuse issues.....
lechwe - LECH-way [or, as phoenix says, LECH-weh which is a similar sound] (from the Sechuana name
leche)
duiker - DYE-kuh (Afrikaans, 'diver', the name actually being a shortened form of duikerbok 'diving buck')
okapi - oh-KAH-pee (Wambutti (Bambuti)
o'api -- the apostrophe is a glottal stop so to European ears it sounds most similar to a 'k' sound)
fossa (or fosa) - foosh or FOO-shuh (Malagasy. The 's' is pronounced like a 'sh', and the last 'a' should properly be dropped) - I will admit I cannot bring myself to call it a 'foosh', it just
sounds wrong!
sifaka - shee-FAHK (Malagasy -- again, the 's' is pronounced 'sh', and the last 'a' is dropped)
takin - TAH-kin (from a North Assamese name)
zebra - ZEH-bruh [although all Americans of course pronounce it ZEE-bruh, because they have their own special way of (mis)pronouncing words

] (from Portuguese, probably from Arabic
zeora, imitative of the call of the Grevy's zebra, but another suggestion is from Congolese or from Abyssinian
zibra 'striped')
orang-utan - pronounced as Zooish says [another Malay name that constantly annoys me with mispronunciation is siamang -- see-uh-mung,
not sye-uh-mang]
touraco - TOO-ruh-koh (from French, from a native name which is imitative of the call)