Identification 21 Orchids 11 Pictorial works 8 Ecology 7 Mathematics 7 Study and teaching 7 Varieties 6 Botany 5 Islam 5 Moon 5 Observations 5 Religious aspects 5 Stick insects 5 Wildlife conservation 5 Arithmetic 4 Birds 4 Conservation 4 Dendrobium 4 Environmental aspects 4 Insects 4 Plants 4 Rain forests 4 Research 4 Calendar, Islamic 3 Fasts and feasts 3 Forests and forestry 3 Geology 3 History 3 Mammals 3 Marine ecology 3