A Semiconductor device includes a semiconductor substrate, an insulating film, a first conductive film, a ferroelectric film, an insulating layer, a first plug and a second plug. The semiconductor substrate includes a source region and a drain region which are formed on a main surface thereof. The insulating film is formed on the semiconductor substrate such that the insulating film is located between the source region and the drain region in a plan view. The first conductive film is formed on the insulating film. The ferroelectric film is formed on the first conductive film. The insulating layer covers the first conductive film and the ferroelectric film. The first plug reaches the first conductive film. The second plug reaches the ferroelectric film. A material of the ferroelectric film includes hafnium and oxygen. In plan view, a size of the ferroelectric film is smaller than a size of the insulating film.

Embodiments relate to a habitat for insects. The habitat includes a laminated structure made from plural sheets. Each sheet has grooves formed on either side of the sheet, wherein the grooves of one sheet are not parallel to the grooves of an adjacent sheet. Each sheet is made from cardboard and is coated with cellulose or other similar material.

An insect rearing/breeding housing, wherein a plurality of crates arranged in a row along the length of the housing define at least a portion of the housing bottom. Holes formed in the bottom of the crates allow for air to be sucked into the housing and to be discharged through at least one air ventilating opening of the housing. The housing having a crate insertion opening in at least one end and a crate discharge opening at the housing bottom. The crates being supported so as to be movable from said insertion opening to the discharge opening.

An insect rearing/breeding housing, wherein a plurality of crates arranged in a row along the length of the housing define at least a portion of the housing bottom. Holes formed in the bottom of the crates allow for air to be sucked into the housing and to be discharged through at least one air ventilating opening of the housing. The housing having a crate insertion opening in at least one end and a crate discharge opening at the housing bottom. The crates being supported so as to be movable from said insertion opening to the discharge opening.