Take nine levels of wizard and a level of Druid then get DM permission to use Permanency with the Speak with Animals spells, plus pay the material cost of 2,500 gp (from the examples given in the CRB). Probably the cheapest way to do it. Maybe your DM will let you cast it on yourself and allow an arcane caster to cast permanency on you. Or you can have a magic item crafted for 30K gp. Of course Permanency is susceptible to Dispelling.

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