Use a square of paper.
1 Valley fold the square in half on diagonal. Press it flat and unfold it. Then repeat it making other diagonal. After that, turn the paper over.
2 Valley fold the square in half from the side to opposite side. Press it flat and unfold it. Repeat it for other pair of sides.
3 Press the middle of the fold-lines, until the sides pop up. Bring the sides together and down towards you. Press the top down neatly into a square, thereby completing a square base.
4 Valley fold the front flap's lower sloping edges over, so they lie along the middle fold-line. Valley fold the top point down as shown. Press them flat and unfold them. Repeat it behind.
5 Pinch and lift up the front flap of paper, so that its edges meet in the middle.
6 Press the paper flat. Turn the paper over.
7 Pinch and lift up the front flap of paper, so that its edges meet in the middle. Press the paper flat.
8 Valley fold the left-hand lower sloping edge over, so it lies along the vertical middle line. Repeat behind.
9 Inside reverse fold the bottom point: Pinch the bottom point and pull it up inside the model.
10 Valley fold the top layer to itself on a line of internal sloping edge (which is shown by an invisible line).

11 Valley fold the top layer, so his bottom edge meets the top sloping edge.
12 The marked place will be enlarged.
13 Valley fold the right-hand point along the sloping edge and in the same time make a "mountain" crease as shown. Look at the next step for clear result.
14 Valley fold the top layer on a line between the specified points.
15 Valley fold the left-hand edge of the top layer as shown, thereby making a foot of the dino.
16 This should be the result. Repeat steps 10-15 behind.
17 Double step fold the top point, to make the dino's head. Valley fold the right-hand lower sloping edge over, so it lies along the vertical middle line. Repeat behind.
18 Step fold the tip of the head, thereby making the jaw. And from right-hand side, inside reverse fold the bottom point: pinch the bottom point and pull it up inside the model.
19 Press on the center slightly, stretching the opposite edges.
Dino is ready!