I will show you how to make an animatronic hand. This is very similar to tanntraad's hand, but it uses common objects that most people have at home.
Step 1: Materials
5 drinking straws - I used Glad Flexible straws. You can use bendy or non bendy.
Some string or twine - I used some twine. Any fairly strong string will do.
Tape - I used tiny strips of duct tape. You can use any tape, but I'd avoid Scotch tape. Not strong enough.
Step 2: Cutting - the Straws
First, if your straws are bendy, cut off the the bendy bit. Then, cut the straws to this length or your length.
Straw 1 (index): 4 7/8" (~12.3 cm)
Straw 2 (middle): 5" (~13 cm)
Straw 3 (ring): 4 3/4" (~12 cm)
Straw 4 (little): 4" (~10 cm)
Straw 5 (thumb): 3 1/2" (~9 cm)
Measure 1/2 an inch in from the end of straw 1, pinch it and cut a V shape about half way in. If you don't get what I mean by a V, check out step 3, pic 3. Then measure an inch from the bottom of the V, and cut another V. Measure another inch, and cut the third and final V. Repeat on straws 2, 3, and 4. Do this on straw 5, but make the first & second and second & third Vs 3/4" apart. These Vs will be the knuckles/joints. On the thumb (straw 5), make a 4th cut perpendicular to the Vs that runs from just below the 3rd V to the midpoint of the straw.