Why did the Philippine Eagle become endangered?

Barely three percent of the Philippines old growth forest remains, most of them threatened by expanding agriculture, illegal logging and mining.

Deforestation, unproductive slash and burn practices, land conversion for development and agriculture, Hunting, shot or trapped, either for food, out of despair over livestock allegedly lost to nesting eagles, or out of plain curiOSity and ignorance.

Philippine eagle's population:

As recent estimates suggest that there may be 500 or fewer pairs of them left in the wild down from an estimated 6,000 individuals in the 1900's.

because many people cut down the tree and they kill the Philippine eagle and sell them

Habitat loss and poaching.

They are mainly endangered because of deforesting, but mining, poaching, and pollution are also problems to these birds. Save them!
Philippine Eagles became an endangered species because of people hunting them (poachers), due to logging and agriculture that reduces their habitat, and due to chemicals in the environment that affect them. The population of Philippine Eagles is decreasing to a very low level and it is considered "critically endangered."

We should treat them properly and refrain from killing innocent animals.
Yes. The Philippine Eagle is one of them. Mostly because many people are killing them.