A bird feeder including a removable base, which is configured to be easily removed from the body of the bird feeder by simply pulling the knob downwards to disengage the base from the main body of the enclosure, may be provided. An enclosure may include a top and bottom opening and a side wall. The bottom end of the enclosure may be enclosed by a base member including a pull knob device fixed inside the base member. The base member may be releasably secured to the enclosure by a pull knob mechanism. The base member can be easily removed using pull knob mechanism such that as the pull knob is pulled downwards by a user, locking pins engages a taper slider of the pull knob device and retracts horizontally in the inward direction.