The aim of this work is to design a battery-powered IoT device to be placed on snap traps for wildlife trapping. The use of this device aims to simplify and streamline the work of the forest administration. The device, whose functions are controlled by an ESP32 microcontroller, is connected to the network using NB-IoT technology, specifically CatM-2 technology and the corresponding SIM card. This allows the device to operate seasonally and without the need to pay flat fees, as is the case with competing devices. The device also allows the recognition of captured animals based on their weight, which will reduce the number of incorrect trap triggers and thus allow the forest management to capture only a narrower range of animals. At the same time, however, unlike devices that take photographs or videos, the amount of data to be transmitted is reduced.