The cape parrot (Poicephalus robustus) is endemic to South Africa. In contrast to the male, the female has a red forehead. It is a vulnerable species and its trade in the pet market is illegal. It feeds on seeds, nuts, berries and nectar.

The hyacinth macaw (Anodorhynchus hyacinthinus) is another vulnerable species of parrot native to central and eastern South America. It is the largest macaw species. It feeds on nuts and fruit. It can be kept as a pet.

The sulphur-crested cockatoo (Cacatua galerita) can be found in northeastern Australia, New Guinea and some Indonesian islands. It has four subspecies. It feeds on fruit, seeds and buds. It can also be kept as a pet.

The stamps were issued in 2016.

Thank you Boben for this nice registered cover from India. The m/s was released in 2010. Both the birds it shows are very common. About the Rock Pigeon you can have a look in older posts.
House Sparrow (Passer domesticus): It can be found in most of Europe and Asia. It has 12 subspecies. It feeds mostly on seeds and insects but it is also an opportunistic bird.

Thank you Boben for this nice postcard from India. The 2009 penguin stamp comes from a set of two. The other stamp shows polar bears. The set was issued in 2009 under the topic Preserve the polar regions and glaciers, a topic under which many countries issued stamps last year. About the Emperor Penguin you can read in the post about Chile's cover.