A bird cage is a closed structure used to house pet birds. It is usually made of metal or wire and has a door for easy access to the birds inside. Bird cages come in different sizes and shapes, depending on the type of bird being kept. They typically include perches, food and water containers, and sometimes toys to keep the birds entertained. Bird cages help keep pet birds safe and comfortable while allowing them to move around inside. They are often placed indoors but can also be used outdoors in some cases.

英語での「bird cage」の定義と意味

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