Architecture / Hard-scapes   (buildings, bridges, doors, fountains, and statues)

Waterfowl (ducks, geese, swans, shorebirds)

Non-waterfowl  (songbirds and birds of prey)

Butterflies & Dragonflies   (The most popular of insect searches - I have included these in a single category)

Wildlife & Insects   (mammals and reptiles, all insects excluding butterflies and dragonflies)

Flora and Fungi   (aquatic and terrestrial plants, flowers, leaves, and fungi including mushrooms and toadstools)

Scenic / Outdoor scenes   (landscapes, waterscapes, and waterfalls)