this.mammal = new Mammal();
this.mammal.name = "Mamet";
this.mammal.longHair = true;
ofy().save().entity(this.mammal).now();
this.cat = new Cat();
this.cat.name = "Catrina";
this.cat.longHair = true;
this.cat.hypoallergenic = true;
ofy().save().entity(this.cat).now();