The little bustard (Tetrax tetrax) can be found in southern Europe and central and western Asia. It is partly migratory. The breeding male has a blue-grey face and bands of black and white feathers on its neck while the non-breeding male and the female are brown coloured. It feeds on both plant material and terrestrial invertebrates. Due to habitat loss, it is near threatened.

The bluethroat (Luscinia svecica) is widespead across Europe and Asia. It can also be found in Alaska and the Yukon Territory. It is migratory. It has twelve subspecies. It can mimic the sound of other birds. The male, shown on the stamp, has a blue and read throat while the female has a white one. Finally, it feeds on insects and other invertebrates and plant material.

The stamps were issued in 2012.

The European robin (Erithacus rubecula) can be found in Europe, western Asia and north Africa. The northern populations are migratory. It has nine subspecies. It feeds on earthworms, spiders, small insects, fruit and seeds. It also occationally consumes carrion and very small lizards and fish.

The Eurasian blue tit (Cyanistes caeruleus) is native to Europe and parts of western Asia. It has nine subspecies. It feeds on small invertebrates, fruit and seeds.

As for the house sparrow (Passer domesticus) and the Eurasian magpie (Pica pica), we have seen them before.

The stamp set was issued in 2018.

This cover from France shows the males of various french breeds of the red junglefowl (Gallus gallus), a species presented in the past. The three stamps belong to a set of four issued in 2015.
 

Another french cover, this time a California's Condor (Gymnogyps californianus) stamp issued in 2009.
The Condor now lives only in a few places in North America. This large vulture can live up to 50 years and it has a bald head and black plumage. On the underside of its wings it has white patches. It feeds on dead mammals. Condors almost became extinct thanks to humans but a conservation project help to increase their numbers.

Nice cover with both machine and clear hand cancellation. However, the cancel on the first stamp doesn't cancel the envelope as well and if you look closely you can notice not only the date is two years older from the rest cancels but the town is different too. This stamp, which was issued in 2007, has been used twice. The second stamp was issued in 1995.

Barau's Petrel (Pterodroma baraui): It is a medium size petrel living in the area between Indonesia and western Australia. It feeds on small fish which catches by surface-seizing and plunge diving. It is an endangered species.

Common Tern (Sterna hirundo): Another sea bird which is migratory. It lives in the sud-arctic areas of Europe, north and central America and Asia. It also feeds on fish which catches by plunge diving. It doesn't fish just in the sea but in rivers and lakes too.