Norman said he only does bird taxidermy, thinking that bird taxidermy looks better, and hates beasts such as foxes or apes being taxidermied, because he can also develop a relationship with bird taxidermy.
Guess: Buying some chemicals to make specimens may also be used to dispose of the mother's body at the same time. Avian taxidermy symbolizes mother in some way?
Finally, the monologue of the mother's personality is as motionless as a bird specimen.
"A boy's best friend is his mother." The young and sunny boy on the surface usually has no friends to play with, but his best friend is his mother, so the audience can't help but be surprised.
Inner monologue from Norman, wrapped in a blanket, as a mother: It's so sad that a mother should tell the whole world that her son is a murderer, but I can't make them think I'm a murderer. They won't pursue it - just like a few years ago. He's always been bad, and to this day he still says I killed that girl, and that man. As if I could do anything but sit here like those taxidermy, they know I can't even move my fingers. I don't move either, I just sit here and don't make a sound, lest they really doubt me. They may be spying on me.
The character of the mother here is interesting: I can't let them think I'm a murderer, and I feel sad to tell the world that my son is a murderer. The mother's personality denies that she killed herself because she feels that she is not moving at all, and the mother's personality is trying to show that she did not kill. But at the same time, the conclusion that the psychiatrist and Norman talked about: Norman's mother's personality admitted to killing people. There is a contradiction here. Is it the personality of Norman’s mother that drives Norman’s personality to kill? If the sub-personality does not occupy the main character, what is the motive for the main character to kill?
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