Toxic wood/trees in Ohio?

[TamiKakes]

Anyone know what trees/ wood in NorthEast Ohio is dangerous to squirrels or where to find the information? ? I want to start looking for branches, twigs with leaves ect for Ashlies cage.

[cava]

There's a list of safe wood/trees on the following healthy foods list. I googled each one and memorized what they look like before foraging.

This list is also in squirrel nutrition section if you're having trouble seeing it