This album page provides links to galleries that feature images of Mammals. Each gallery displays portraits of individual species together with juvenile/immature species when I’ve been able to photograph them and some behaviour images. See Taxonomy note below.
The first figure shows simplified taxonomy family tree applicable to Egg-laying Mammals and Marsupial Mammals photo album, which contains:
(1) Order Monotremata (Monotremes) placed in subclass Prototheria (Egg-laying Mammals).
(2) Infraclass Metatheria (Marsupial Mammals) contains three Marsupialia orders:
(a) Dasyuromorphia (Carnivorous Marsupials),
(b) Diprotodontia (Kangaroos, Wallabies, Possums, and relatives). This order splits into three suborders: (i) Macropodiformes (Kangaroos, Wallabies, and relatives), (ii) Vombatiformes (Wombats and Koalas) Phascolarctidae (Koalas) and Vombatidae (Wombats), and (iii) Phalangeriformes (Possums),
(c) Peramelemorphia (Bandicoots).
The second figure shows a simplified taxonomy family tree applicable to Placental Mammals which contain several orders grouped in the following photo albums:
(1) Cetacea (Cetaceans) displaying dolphins and whales together with Carnivora (Carnivores) featuring marine, land and semiaquatic mammals.