I've been saying this for a long time.

[Bogertophis]

...I often check for boa constrictor videos in the wild and find a lot of them show the boas in trees...

I'm not surprised by that either...what a great place to bask in semi-sunshine & catch birds. When I had a BCI & strolled my back yard with her, she always wanted to climb from my shoulders into my trees, but sadly I couldn't allow it, they're way too big. Climbing also affords them a chance to maintain & build healthy muscle tone.