Egg embryo is adequately developed it hatches, i.e. breaks out of the egg's shell. Some embryos have a temporary egg tooth they use to crack, pip, or break the eggshell or covering. The largest recorded egg is from a whale shark, and was in size. Whale shark eggs typically hatch within the mother. At and up to , the ostrich egg is the largest egg of any living bird, though the extinct elephant bird and some dinosaurs laid larger eggs. The bee hummingbird produces the smallest known bird egg, which weighs half of a gram (around 0.02 oz). Some eggs laid
Jurong Bird Park to the public. Jurong Bird Park is now a world-famous bird zoo where there are specimens of magnificent bird life from around the world, including a large flock of flamingos. It is currently the world's largest bird park in terms of the number of birds, and second largest both in the number of bird species and land area (after Germany's Weltvogelpark Walsrode). There are 5,000 birds of 400 species in Jurong Bird Park, of which 29 are of threatened species. In 2006, Jurong Bird Park completed a S$10 million makeover. As a result of the upgrade, the park got a