If someone purposefully obsessed over a certain animal how much might it impact their chances of rebirth as that animal?

And im looking for a buddhist perspective mainly, preferrably the views of various traditions. But yeah, if i (for example) wanted to be reborn as a bird, would obsessing over and even acting birdlike, practicing a birdlike mentality, living on seed (grain)... even dying with bird thiughts in full swing... stuff like that, would the attachment and desire cause my mind to reform into a bird? (Sidenote- i do not want to be reborn as a bird. It is a valid point i am trying to understand in a round about way).