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Eggs of black-veined white (Aporia crataegi) on apple leaf A butterfly from the genus Euploea, laying eggs underneath the leaf. Butterfly eggs are protected by a hard-ridged outer layer of shell, called the chorion. This is lined with a thin coating of wax which prevents the egg from drying out before the larva has had time to fully develop.
These are thought to protect the plant as the butterfly avoids laying eggs near eggs already on a host plant, to give her own eggs the best chance of survival. A later example is the mimicking of a mammalian hormone by an ant toxin which causes long-lasting hypersensitivity, Gilbertian mimicry at a molecular level.
The butterflies avoid laying eggs near existing ones, reducing intraspecific competition between caterpillars, which are also cannibalistic, so those that lay on vacant leaves provide their offspring with a greater chance of survival. The stipules thus appear to have evolved as Gilbertian mimics of butterfly eggs, under selection pressure from ...
A popular Easter tradition in some parts of the world is the decoration of hard-boiled eggs (usually by dyeing, but often by hand-painting or spray-painting). Adults often hide the eggs for children to find, an activity known as an Easter egg hunt. A similar tradition of egg painting exists in areas of the world influenced by the culture of Persia.
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The top of the egg is depressed and forms a small central cavity called micropyle through which the egg is fertilised. [11] The micropyle is situated on top in eggs which are globular, conical, or cylindrical; in those eggs which are flattened or lenticular, the micropyle is located on the outer margin or rim.
The butterfly uses only its middle and hind legs when walking and clinging. [49] Adults typically live for 2–5 weeks during their breeding season. [24]: 22–23 Larvae growing in high densities are smaller, have lower survival, and weigh less as adults compared with those growing in lower densities. [50]
The butterfly hibernates over winter before laying its eggs in early spring, in batches of up to 400 at a time. [3] The olive green eggs are ribbed. They are laid on both the upper parts and the undersides of leaves of nettle plants [9] and hops. [citation needed] The caterpillars hatch after about a week. They are shiny black with six rows of ...