When it comes to mirrorless cameras, the type of memory card you use is essential for maximum performance.
When focusing speed and image quality are important, as is often the case with bird photography, you'll want to ensure that your camera supports a high-speed UHS-II memory card. They offer fast read/write speeds, meaning your camera will be able to capture more frames in higher resolution than a standard UHS-I card could manage.
Furthermore, they're designed to withstand harsher conditions than standard cards, making them ideal for outdoor shooting in all kinds of weather.