In a large bowl, beat together the sweetened condensed milk and water until well combined.
Add the pudding mix and beat well - for about 2 or 3 minutes.
Cover and refrigerate for 3-4 hours or overnight. This will allow the pudding mixture to properly set.
In a large bowl, whip the heavy cream until stiff peaks form.
Fold the whipped cream into the pudding mixture there are no streaks of pudding.
Assemble the dessert in individual portions or a large bowl or dish with a 4-5 quart capacity.
To assemble, arrange 1/3 of the animal cookies on the bottom of the dish/dishes. Next, layer 1/3 of the bananas and 1/3 of the pudding mixture. Repeat twice more.
Garnish with additional animal cookies on top.
Cover tightly and allow to chill in the fridge for at least 4 hours.