Step 1:
Prefold in half over these 4 lines.

Step 6:
Fold this edge downwards.

Step 5:
Prefold over these 2 lines

Step 2:
This is the other side.
Valley-fold over the 2 lines at the bottom right, mountain-fold over the 2 diagonal lines. And valley-fold over the 2 lines at the top left.

Step 4:
Squash-fold

Step 3:
Fold one flap straight upwards

Step 10:
Fold the triangle flap to the inside.

Step 8:
Fold the triangle flap upwards.
Repeat steps 4 to 8 on the other three flaps.

Step 9:
Pull open.

Step 7:
Press these edges downwards / flat.

Step 16:
Repeat steps 13 and 14 on the left

Step 15:
Bookfold one layer to the right, do the same on the backside.

Step 12:
Open the model here.

Step 11:
Close the model again.
Repeat steps 9 to 11 with the other three triangle flaps.

Step 14:
Make an inside reverse fold.

Step 13:
Make an inside reverse fold

Step 19:
Hold the model in one hand at the place indicated by the large dot, then press the top flat with your other hand, see arrow.

Step 20:
Fold the tail upwards

Step 18:
Fold downwards, see arrows (make the same fold as the short pink line, on the backside).

Step 17:
Make an outside reverse fold over the 3 white lines, fold the model in half over the pink line while you do this.

Step 21:
Pull / press the edges apart, see arrows as example.