Thank you for submitting your item for appraisal. This appears to be a 19th century venetian Grotto chair in the form of an exotic bird like creature. Grotto furniture is a form of phantasy furniture created in Venice and other parts of Italy, originally referring to the mannerist style of garden grottoes of the 16th century.
The chair in your possession was part of a series of near identical chairs manufactured possibly in the mid 19th century. The estimate is based on similar chairs sold at auction.