According to a local wildlife official:
The tiger was probably hunting for prey and mistook Tambun for a mammal.Unless there is a translation issue, I'd say the tiger was absolutely correct in his identification.
Over the past couple of months we have had a Sharp-shinned Hawk case our birdfeeders from the comfort of our fence, and I have considered ways to encourage it to punch above its weight* and go after a squirrel. Next time I wish for a larger predator, I guess I'll count my blessings.
*Money quote from that link:
A small hawk, the Sharp-shinned Hawk is a regular visitor to bird feeders, where it eats birds, not seed.