The family of my daughters best friend in junior high had llamas.

They need physical conditioning. You can not take them on a week long trip once a year and leave them in the pasture the rest of the year.

They need socialization. You need to spend time with them to get the behavior you want.

You need to pull a trailer. Forget key exhange hikes and shuttles.

They need a little "sweet grain" when worked, but they also need time to graze. I can hike more hours per day then they can.

I still have a standing offer to take llamas out, but never do.
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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra