Issued in 2024, this stamp depicts the critically endangered Philippine eagle (Pithecophaga jefferyi). As obvious by its name, it is endemic to the Philippines and it is the country's national bird. It feeds on mammals, reptiles and birds.
 

Thank you Daniel for this nice cover from Philippines. The first two stamps are a part of set of four issued in 2009. The last stamp, also coming from a set of four, was released in 2004. In the Philippines can be found 16 owl species.
Luzon Scops-owl (Otus longicornis): It is endemic to the mountains of Luzon island in Philippines.
Philippine Eagle-owl (Bubo philippensis): Another owl endemic to the Philippines. It is classified as vulnerable. It feeds on small mammals and birds and it has two subspecies.
Philippine Scops-owl (Otus megalotis): Also endemic to the forests of the Philippines. It feeds on insects.

Another registered cover from Philippines this time with full 2007 Kingfishers set. A 1993 anti-TB seal is also used.
Variable Dwarf Kingfisher (Ceyx lepidus): It can be found in subtropical and tropical forests in Philippines, Indonesia, Papua New Guinea and Solomon Islands.
Spotted Wood Kingfisher (Halcyon lindsayi): It is endemic to Philippines and it can be found in tropical and subtropical forests.
White-breasted Kingfisher (Halcyon smyrnensis): It is a tree kingfisher living in eastern Europe and Asia. It feeds on fish, snakes, insects, earthworms, small reptiles, birds, crabs, small rodents and amphibians. It has four subspecies. I believe that H.s.gularis is shown on the stamp as it is the subspecies that can be found in Philippines.
Collared Kingfisher (Todirhamphus chloris): It can be found from Red Sea to southern Asia to Australasia and up to Polynesia. It has about 50 subspecies! It feeds on small crabs, small fish, lizards, worms, frogs, insects, snails and shrimps.
Palawan Peacock-Pheasant (Polyplectron napoleonis): This medium-sized pheasant is also known as Napoleon Peacock-Pheasant. This endangered species is endemic to the Philippines.

In 2008 Philippines issued a set of four parrot stamps. Here is a registered cover with three of them along with 2009 Mugimaki Flycatcher stamp.
Red-vented Cockatoo (Cacatua haematuropygia): This endangered species is endemic to Philippines. One of the factors that threaten it is its popularity as a pet. It feeds on seeds, fruit, flowers, nectar and buds.
Great-billed Parrot (Tanygnathus megalorhynchos): Another pet parrot. This bird can be found in forests, mangroves and woodlands is south-east Asian islands. It feeds on fruit.
Blue-naped Parrot (Tanygnathus lucionensis): It can be found in forests and plantations in Philippines and Borneo. It feeds on berries, seeds, grain and nuts. It has three subspecies and it is threatened by illegal trade in the pet market.

Thank you Jan for this envelope from Philippines. Both bird stamps were issued in 2009.
Mugimaki Flycatcher (Ficedula mugimaci): It is also known as Robin Flycatcher and it lives in eastern Asia. It is a migratory bird and it feeds on insects.
Brown Shrike (Lanius cristatus): This bird lives in temperate Asia and in winter it migrates in tropical Asia. It has some subspecies.