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Collezioni / Scultura / Oggetti naturali
Le uova sono tradizionalmente il simbolo di una nuova vita, ma anche del mistero religioso. L’uovo è legato all’immagine della nascita: non soltanto della natura, ma dell’uomo. Durante la festa di celebrazione dei morti, il venerdì successivo la Pasqua, gli ortodossi colorano le uova di rosso e le lasciano sopra le tombe dei propri defunti come augurio di vita ultraterrena. La tradizione risulta legata a una leggenda su Maria. Uova storicamente celebri sono confezionate dal maestro orafo Peter Carl Fabergé nel 1883, commissionate dallo zar Alessandro come dono per la zarina Maria. L’uovo è motivo ricorrente nelle opere di Salvador Dalí. Associato al periodo prenatale e intrauterino, è un simbolo di speranza e amore. In zoologia un uovo è definito come un vaso organico all’interno del quale sviluppa un embrione.
On Egg
→ In zoology, an egg is an organic vessel in which an embryo first begins to develop. In most birds, reptiles, insects, molluscs, fish, and monotremes, an egg (Latin, ovum) is the zygote, resulting from fertilization of the ovum, which is expelled from the body and permitted to develop outside the body until the developing embryo can survive on its own. The term “egg” is used differently outside the animal kingdom, for an egg cell (sometimes called an ovum). Reproductive structures similar to the egg in other kingdoms are termed spores, or (in spermatophytes) seeds.
Oviparous animals are animals that lay eggs, with little or no other development within the mother. The study or collecting of eggs, particularly bird eggs, is called oology. Reptile eggs, bird eggs, and monotreme eggs, which are laid out of water, are surrounded by a protective shell, either flexible or inflexible. The special membranes that support these eggs are traits of all amniotes, including mammals. Eggs laid on land or in nests are usually kept within a favourable temperature range (warm) while the embryo grows. When the embryo is adequately developed it breaks out of the egg’s shell. This breaking out is known as hatching. Baby animals which have just hatched are hatchlings, though standard names for babies of particular species continue to apply, such as chick for a baby chicken. Some embryos have a temporary egg tooth with which to crack, pip, or break the eggshell or covering. The 1.5 kg (3.3 lb) ostrich egg is the largest egg currently known, though the extinct Aepyornis and some dinosaurs had larger eggs. The Bee Hummingbird produces the smallest known bird egg, which weighs half of a gram. The eggs laid by some reptiles and most fish can be even smaller, and those of insects and other invertebrates can be much smaller still. ←
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