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Hyla cinerea is very common in la. The stripes on them are very variable. That is definitely h. Cinerea. It would be very unlikely for it to be anything else.
This is a picture of the canebrake rattlesnake at audubon zoo
That is definitely the black racer at audubon zoo. I recognize the substrate the waterbowl and the snake's face
Looks like hyla cinerea to me
Its a gulf coast ribbon snake judging by the observation location