Ok thank you.. I found another one which is approx. 22x22x40 (inches), I like this one very much but the problem is that I would have to buy another cage for travels, because I couldn't put this on the car.
I put the link here
http://www.donmascota.es/productos/paja ... o-891-gris Do you think this is an appropiate one? Could a cockatiel (or maybe two) be happy here?