The Hunter is a hybrid class introduced in Advanced Class Guide, and is a mix between a Ranger and Druid. In many ways it is halfway between the two, both in martial capability and spellcasting capability. The Hunter follows a 3/4 BAB progression like a Druid. The Hunter also uses both the Druid's and Ranger's spell lists, but has a 2/3 spell progression that advances up to 6th level spells.
The base Hunter class relies heavily on teamwork feats and its Animal Companion, which receives greater bonuses compared to the animal companions of a Ranger or Druid.
However, the Feral Hunter archetype trades out its Animal Companion features and most bonus feats, and in exchange gets extra polymorphing and summoning capabilities. At 4th level, they get a limited version of the druid's Wild Shape feature.
At 4th level, a feral hunter gains the ability to change shape. This ability functions like the druid wild shape ability, except the hunter can take only animal forms (not elemental or plant forms). The hunter’s effective druid level is equal to her class level.