A blog carnival is a moving periodic blog posting collecting current entries in a particular topic, designed to give blog readers a list of things to do that they really do want to do. Current carnivals of which I’m aware are Berry Go Round, which is about plants; Carnival of the Blue, which is about stuff in the ocean; I and the bird, which is about birds, Festival of the Trees, which is about, you guessed it, trees; and Circus of the Spineless, which is about invertebrates such as insects and slugs and so on.
Visit these carnivals, click on the links therein, and enjoy.