Step 1:
I taped a green paper to a black paper. Prefold over the four yellow lines.
 

Step 6:
Prefold.

Step 5:
Squash-fold the flap.

Step 2:
Mountain-fold the four corners to the center.

Step 4:
Fold one flap upwards.

Step 3:
First valley-fold over the two lines at the bottom-right. Then mountain-fold over the two diagonal lines. And valley-fold over the two lines at the top left.

Step 10:
Repeat steps 5 to 9 on the other three flaps.

Step 8:
Press the edges downwards.

Step 9:
Fold the triangular flap upwards.

Step 7:
Fold this edge downwards.

Step 16:
Pull the upper paper layer upwards.

Step 15:
Fold one edge on the right and one on the left upwards.

Step 12:
Fold the triangular flap to the inside.

Step 11:
Pull both ends outwards.

Step 14:
Repeat steps 11 to 13 three more times.

Step 13:
Press both ends towards each other again.

Step 21:
Pull the end downwards.

Step 19:
This flap isn't folded upwards. Fold both edges outwards. Curve the flap backwards while you do this.

Step 20:
Open the model, see arrow.

Step 18:
Fold the new / extra flap upwards.
Repeat steps 15 to 18 three more times. One flap doesn't need to be folded upwards (=step 18).

Step 17:
Valley-fold over these lines.

Step 22:
The arrow shows the end/leg of step 21.
Now pull / fold this end downwards.

Step 28:
Fold the model in half

Step 25:
Fold the legs in half over the length.

Step 26:
Bend / fold the tips upwards over the short yellow lines.

Step 24:
Repeat steps 21 to 23 on the left.

Step 23:
The arrow shows the end/leg of step 22.
Pull / fold the third end downwards.

Step 27:
Valley-fold over the upper line first.