Speaking of possums, synthetic fibre netting such as the kind used to keep
off birds will not do they definitely chew through that. It needs to be
metal. They are excellent climbers and leapers so if the fence is climbable
it needs an electric wire too. The effective combination that I have seen
is a normal height wire fence around the orchard with dog wire (metal mesh
about 6cm grid) added to fill in between the standard wires plus an electric
wire on standoffs near the top on the outside. They climb the mesh but then
touch the electric line and jump off.
I have no experience of opossums.
Weldmesh would do the job provided they cannot climb over it.
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