What is the common method to identify mice with an implanted device beneath the skin?

• A. They are implanted in the tail muscle
• B. Microchip implanted in muscle
• C. Tattooing on the tail
• D. A microchip is implanted under the skin using a hypodermic needle

Answer: (D)

Subcutaneous microchip implantation provides permanent, readable identification for mice with an implanted device. A tiny RFID chip is placed under the skin, usually between the shoulder blades, using a hypodermic needle. Once in place, a handheld scanner reads the chip to reveal the animal’s unique ID, allowing quick identification during routine checks without handling the mouse extensively. This approach is preferred because the chip is durable, remains stable under the skin, and can be read easily without affecting fur or requiring visible markings. Implanting a chip in muscle isn’t the standard practice for identification, and tattooing on the tail, while another method, does not involve an implanted device beneath the skin and can fade or be less reliable over time.