An animal monitoring device (300, 300A) comprising: memory circuitry; interface circuitry configured to communicate via short-range wireless communication to a second animal monitoring device and cellular communication; and processor circuitry configured to obtain, from a first sensor (304, 304A), sensor data having a first transmission deadline and provide the sensor data into a sensor data set; wherein, when the animal monitoring device (300, 300A) is in range, using the short-range wireless communication, with the second animal monitoring device, the animal monitoring device (300, 300A) is configured to: - receive, from the second animal monitoring device, a second battery parameter indicative of battery level of the second animal monitoring device; - determine if the second battery parameter satisfies a first criterion based on a first battery parameter indicative of battery level of the animal monitoring device (300, 300A), - when the second battery parameter satisfies the first criterion, receive, via the short-range wireless communication, from the second animal monitoring device, second sensor data having a second transmission deadline and add the second sensor data into the sensor data set; and - when the second battery parameter does not satisfy the first criterion, transmit data in the sensor data set via short-range wireless communication to the second animal monitoring device; and control the transmission, via the cellular communication, of data in the sensor data set based on the first transmission deadline or the second transmission deadline. memory circuitry; interface circuitry configured to communicate via short-range wireless communication to a second animal monitoring device and cellular communication; and processor circuitry configured to obtain, from a first sensor (304, 304A), sensor data having a first transmission deadline and provide the sensor data into a sensor data set; wherein, when the animal monitoring device (300, 300A) is in range, using the short-range wireless communication, with the second animal monitoring device, the animal monitoring device (300, 300A) is configured to: - receive, from the second animal monitoring device, a second battery parameter indicative of battery level of the second animal monitoring device; - determine if the second battery parameter satisfies a first criterion based on a first battery parameter indicative of battery level of the animal monitoring device (300, 300A), - when the second battery parameter satisfies the first criterion, receive, via the short-range wireless communication, from the second animal monitoring device, second sensor data having a second transmission deadline and add the second sensor data into the sensor data set; and - when the second battery parameter does not satisfy the first criterion, transmit data in the sensor data set via short-range wireless communication to the second animal monitoring device; and control the transmission, via the cellular communication, of data in the sensor data set based on the first transmission deadline or the second transmission deadline. - receive, from the second animal monitoring device, a second battery parameter indicative of battery level of the second animal monitoring device; - determine if the second battery parameter satisfies a first criterion based on a first battery parameter indicative of battery level of the animal monitoring device (300, 300A), - when the second battery parameter satisfies the first criterion, receive, via the short-range wireless communication, from the second animal monitoring device, second sensor data having a second transmission deadline and add the second sensor data into the sensor data set; and - when the second battery parameter does not satisfy the first criterion, transmit data in the sensor data set via short-range wireless communication to the second animal monitoring device; and control the transmission, via the cellular communication, of data in the sensor data set based on the first transmission deadline or the second transmission deadline.