This man in Rhumsiki, Cameroon, attempts to tell the future by interpreting the changes in position of various objects as caused by a freshwater crab,

I found on inexhaustible Wikipedia a list of methods of future telling, some of them quite promising:

Divination by chance encounters with animals is called apantomancy.
Divination by the ravings of lunatics or Chresmomancy makes sense to me.
I have practiced without knowing so Dictiomancy or divination by randomly opening a dictionary and Ailuromancy by the behavior of cats. Plastromancy is divination by the cracks caused by heating a turtle’s plastron and Myrmomancy tells the future by observing ant behavior.

A Sortilege is technically a divination by the casting of lots, an Augury by the flight of birds.
One can read the lines of the foot as well as the lines of the hand and divine through Podomancy. What a delightful word is Batraquomancy, divination by frogs. I can’t wait to find an opportunity to use in a sentence the words Shadowmancy, Hyomancy, Genethlialogy, Rhabdomancy or Skatharomancy.

Shufflemancy is divination by songs picked by iPod.

Find the full list at https://en.wikipedia.org/wiki/Methods_of_divination

But what did the Ancients think about all this, you will ask? Homer for one has a strong preference.

“The clearest by far of seers is who scans the flight of birds. He knows all things that are, all things that are past, all that are to come.” The Iliad

Portrait of the Poet Homer. Oil on panel. 72,1 x 56,8 cm. The Walters Art Museum, Baltimore. 1639.

Pic: By Amcaja – Own work with Kodak CX6200 digital camera, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=230266