Sipidan/Borneo Orangutans Lenses?????

Doing 3-4 days of Orangutans, river, jungle tours. Is it worth packing the Nikon 200-400mm 4.0???

Or do you get close enough the Nikon 70-200mm is enough?

Don't mind hiking with the 200-400 just wondering if it is overkill?

Also doing Turtle Island (?), to see nesting sea turtles, do they allow you to use flashes at night?

Thanks for any input.

I would certainly bring the 200-400 for orangutans and other stuff seen in trees. I have often used a 70-200 with extender, but more often than not wanted more reach. If you go for feedings of orangutans or proboscis monkeys a 70-200 can be enough though.

Never been to Turtle island, so I know nothing about flashes policy there.

Cheers Bent