At the bottom of each image is a Category or 'Labels' section, which shows the pictures name and any other related categories that the image relates to. E.g. If you click on the name of the image i.e. 'Common Poppy' The web page will then only show you all the images of Poppies on the blog; if you were to choose the link for 'Wild flowers' then the site will only display wildflowers and hide all the other items such as Birds, Frogs etc.
Once you have selected a Label type, to get back to view all the images on the site simply choose 'Show all posts' which will be displayed as an underlined link at the top of the blog.
As you scroll through the images, you will see the various categories for each image listed. – Most images are in more than category e.g. A Frog will appear in the Amphibians, Fauna and general Animals categories.