Question: What animal does Boiled egg and Egg as food have in common?

Context articles: Da Bao
Tea egg
Fricasse
Derovo
Pique macho
Sagan (ceremony)
Bacalhau com todos
Egg cup
Egg as food
Boiled egg

Da Bao (大包) or Dai Bao, is an extra large version of the Chinese steamed bun.
 When translated, the name literally means big bun.
 It is commonly sold in Malaysia and Singapore.
 The common fillings found in the Da Bao usually consist of either pork or chicken minced meat and a hard boiled egg.
 Other common fillings include mushroom or Chinese sausage.
Tea egg is a typical Chinese savory food commonly sold as a snack, in which a boiled egg is cracked and then boiled again in tea, sauce and/or spices.
 It is also known as marble egg because cracks in the egg shell create darkened lines with marble-like patterns.
 Commonly sold by street vendors or in night markets in most Chinese communities throughout the world, it is also commonly served in Asian restaurants. Although it originated from China and is traditionally associated with Chinese cuisine, other similar recipes and variations have been developed throughout Asia.
The fricasse (Arabic: فريكسي or فريكاسي‎ ‎ ) is a savory donut often filled with tuna, boiled egg, olives, harissa, and boiled potato usually purchased from a traditional Tunisian food vendor.
 It can be made at home or in fast food restaurants.
Derovo - Derivados de ovos, S.A. is a Portugal-based company headquartered in Pombal and founded in 1994, specialized in the production of pasteurized egg products, in the production of boiled eggs, in the production of Fullprotein (protein drink - world's first egg-white-based drink), and develops egg-based products to the needs of its customers, targeted at various markets such as food industries, pastries, bakeries and confectionery.
 It has the Certification and Quality Control ; and HACCP – Food Safety.
 Derovo is currently present in Portugal, Spain, France and Angola.
 Among its awards are Egg Products Company of the Year Award by the IEC - International Egg Commission (2002); Medalha de Mérito Industrial by the Câmara Municipal de Pombal (2002); Prémio Internacionalização by Gesventure (2004); Certificate of Fullprotein as Selected Trends & Innovations in the Sial – Global Food Marketplace (2006); Toféu Afonso Lopes Vieira as the best Company by the Local Newspaper Região de Leiria (2007).
Pique macho (] ) or Pique a lo macho is a typical Bolivian food.
 It is a heaped plate consisting of bite-sized pieces of beef, and french fry-cut potatoes.
 Added to this mixture are onions, locoto, boiled egg, mustard, mayonnaise, and ketchup.
Sagun (Devanagari: सगं) is a Nepalese ceremony which involves ritualized presentation of auspicious food to a person to invoke good fortune and show respect.
 It is a highly revered ceremony in Newar society of the Kathmandu Valley.
 The food items served are boiled egg, smoked fish, meat, lentil cake and rice wine which represent Tantric concepts.
Bacalhau com todos (literally meaning "codfish with everything" in Portuguese) is a common bacalhau recipe in Portuguese cuisine.
 It consists of boiled codfish, boiled vegetables (such as potato, carrots and cabbage), and hard boiled egg.
 It is served seasoned with olive oil infused with garlic and, depending on taste, also white wine vinegar.
An egg cup, sometimes called egg server, is a container used for serving boiled eggs within their shell.
 Egg cups have an upwardly concave portion to hold the egg and often include a base to raise the egg-retaining portion and give stability, informally known as "footies".
 Egg cups can be made of porcelain, pottery, wood, plastic, glass and various metals or bakelite.
 Some are made of two materials (wood and ceramic).
Eggs are laid by female animals of many different species, including birds, reptiles, amphibians, mammals, and fish, and have been eaten by humans for thousands of years.
 Bird and reptile eggs consist of a protective eggshell, albumen (egg white), and vitellus (egg yolk), contained within various thin membranes.
 The most popular choice for egg consumption are chicken eggs.
 Other popular choices for egg consumption are duck, quail, roe, and caviar.
Boiled eggs are eggs (typically chicken eggs) cooked with their shells unbroken, usually by immersion in boiling water.
 Hard-boiled eggs are cooked so that the egg white and egg yolk both solidify, while for a soft-boiled egg the yolk, and sometimes the white, remain at least partially liquid.