Abstract: The objective of the present invention is to provide a system capable of efficiently and accurately monitoring each individual animal in a group-housed cage with high temporal resolution. Multiple food containers are used in a feeding unit to allow multiple animals to feed freely and simultaneously. Each food container is incorporated with an electronic weight measuring component to continuously monitor the change in food weight in each food container. An electronic RFID tag detector/reader is incorporated at the food accessing opening of each container to identify the animal accessing the food container.