An advantage of sourcing images from books is that they may contain images of extinct animals not found online. Books also contain older styles not seen in recent online images. However, finding books on specific topics can be difficult and accessing images within books may not yield the needed images. Google Images provides easy access to millions of images but their copyright status is unknown and resizing may reduce quality. Specifying criteria also limits options. Stock image sites ensure resolution and allow repeated use but images cost money and can look staged. Personal images allow customization but quality depends on camera skills and equipment. Different resolutions are suitable for different mediums, but higher resolutions have larger file sizes and lower resolutions appear pixelated