Bird's Eye Chili Pepper refers to a tiny type/variety of peppers which is categorized as hot pepper with 50,000 to 100,000 Scovilles. Bird's Eye Chili Pepperoriginated in the countries in Asia, such as Cambodia, Vietnam, Thailand and the Philippines and are very ingredients of these countries Cuisine. 

Presumably, they are called Bird's Eye pepper because they have been spread by the birds which are not affected by its heat. It has a similar heat  as Habanero pepper. They come in yellow, green and red, but said to be in black and purple color  

In the Philippines, Bird's Eye chili pepper is called Siling Labuyo and so far I have only seen them in green, yellow and red colors.  They are used in making dips (Sawsawan) and in dishes, such as Dinuguan and is extensively used in the Bicol Region of the country. In the Philippines, moreover, only do not use the fruits of this plant, but also their leaves which we used for making delicious soupy dishes as Tinola , where the leaves (Dahon ng Sili) is one of the important ingredients.

In the rural and provincial areas of the Philippines, you will mostly see them growing in almost everyone's backyard and they are always  available in the wet markets, we call Palengke. 

 Bird's Eye Chili Peppers in red and green color which is called Siling Labuyo in the Philippines below. Those green leaves are very useful for us, too in the Philippines