I'm going to do this right in 2019. My ability to ID birds, bats and rodents is near-zero right now, and this will be a great way to up my skills. I think herps/fish/invertebrates are still a bit too much of a challenge, but I'll do birds and mammals this year!
Also, the prospect of this challenge got me to take my still-not-entirely-sober self straight to a local sacred fig tree at 7:00am on 1/1, where I got most of the species below before trooping home to sleep at 9:00am. Since then, I haven't been able to add too many - but I'm going to try to get out to some of the wetlands and forests on Mumbai's outskirts in the months to come.
Mammals:
1. Three-striped palm squirrel (Funambulus palmarum)
2. Indian flying fox (Pteropus giganteus)
Birds:
1. Barn owl (Tyto alba)
2. Coppersmith barbet (Psilopogon haemacephalus)
3. Rock pigeon (Columba livia)
4. Indian house crow (Corvus splendens)
5. Black kite (Milvus migrans)
6. Indian myna (Acridotheres tristis)
7. Asian koel (Eudynamys scolopaceus)
8. Rose-ringed parakeet (Psittacula krameri)
9. Purple-rumped sunbird (Leptocoma zeylonica)
That's it for now. But I should be able to get 2-3 bats, 2-3 rodents and 8-10 birds more between my home and that sacred fig, and then I'll have to start venturing out into the funner places. I've had trouble ID-ing bats and rats so far.