For Taking. Use tranquilizing darts. I have an ascendant crossbow and kept killing them by accident. As it seems it takes a lot of tranq arrows take one down. But when using tranq darts it took couple shots but did trick.
The best spot to tame one is on the little island in the corner of the north biodome. Which pretty much is penguin island. Nothing really pops up there to bother you unless you count the ocean. Also dododex does say it has a high tampour drop, but if you have some raw prime meat on you it isn't going to be a problem. Tamed a lv110 it's only 5 pieces of raw prime.
I use a cross bow its almost 50/50 chance it will kill it but if that happens you can just pick out a different kairuku, and feed it raw fish and/or raw meat to tame they are very easy to tame almost dodo like in a way