Egg

Eggs were a method of reproduction where the offspring developed outside the body.

Egg-laying Species
A wide variety of creatures laid eggs, including fish, amphibians, reptiles, birds, monotremes, arachnids and insects. Some specific species include:
 * Aubertide (NA: Human Nature)
 * Bane (SJA: The Lost Boy)
 * Chelonians (MA: The Highest Science)
 * Chimeron (DW: Delta and the Bannermen)
 * Earth Reptiles
 * Gappa (NSA: Snowglobe 7)
 * Gastropod (DW: The Twin Dilemma)
 * Ice Warrior (NA: Lucifer Rising)
 * Krill (PDA: Storm Harvest)
 * Mayflies (TW: Reset)
 * Nostrovite (TW: Something Borrowed)
 * Racnoss (DW: The Runaway Bride)
 * Raxacoricofallapatorians (DW: Boom Town)
 * Saraani (BNA: Dry Pilgrimage)
 * Viperox (DW: Dreamland)
 * Wirrn (DW: The Ark in Space)

Food Source
Eggs were also prepared and eaten as food. On Earth, chicken eggs were eaten.
 * Sarah Jane Smith tried and failed to make scrambled eggs on several occasions. When she tried to make some before Luke Smith went to University, she accidentally caught her kitchen on fire. (SJA: The Nightmare Man)