hi iv just taken on 2 boas cos the owner was moving and needed a good home. they are aprox. 3 years old and in good health the only thing is when they are held they tip thier heads up and over so they double back on them selves! is this a neuroligcal or something major. the bloke i got them off had them for 4 months and he said they were doing it when he got them, they were feeding fine but have not eaten in a couple of weeks, they were kept in his shed heated but temps have been dropping recently, they also both just shed, no problems there. any help wud be great.