This 2001 joint WWF and Brazilian Postal Service stamp issue shows various species of Psittacidae (the parrot family) in their favourite habitat painted by the wildlife artist Etienne Edmonle and in this instance made into maximum cards.
The Jendaya golden-capped conure
All the birds chosen for the stamps are threatened by destruction of their habitat and also targets of illegal wildlife trade. The illegal parrot trade increases the risk of extinction of some species, hence post office plea, "collect stamps not parrots".
An entry to Sunday Stamps