Yes they can swim. BUT, they can't tread water forever. water depth should be deep enough to submerge but not so deep that it can't rest on the bottom.

To treat the partial shed, place a warm damp towel in a snake bag (or pillow case) along with your snake. Place this bag back in the cage where it will keep warm. As gthe csnake explores the bag/towel, it should dampen and slough off the remaining shed.

Long term, if it didn;'t shed right, it's usually an indication the environment is too dry. I don't know your setup but excessive ventilation is a typical root cause for low humidity.
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Thanks,

Dave "Rainbows-R-Us"

0.1 Wife (WC)
0.2 kids (CBB)
2.7 Brazilian Rainbow Boa (adult breeders)
2.5 Brazilian Rainbow Boa (sub-adult from 2004)
4.8 Brazilian Rainbow Boa (sub-adult from 2005)
2.1 Hypomelanistic BRB
0.1 Het for Hypomelanistic BRB
0.1 BCI "Elvira" normal from 1989
1.0 BCI Albino / het-anery
0.1 BCI Salmon / het-albino
0.1 BCI Anery / het-albino
0.1 BCI Salmon (possible super)
1.0 BCI Albino het stripe
1.0 BCI Salmon
0.1 BCI Ghost
0.1 BCI Super salmon, possible jungle
1.0 BCI Salmon, possible jungle
0.1 BCI Super Ghost

lots.lots.lots feeder mice and rats

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