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The clutch is typically 4–6 eggs, which are whitish with reddish-brown speckles. [23] They have a smooth surface and are slightly glossy. [22] The average size is 17.3 mm × 13.0 mm (0.68 in × 0.51 in) with a calculated weight of 1.53 g (0.054 oz). [22] The eggs are incubated for 11–13 days by the female, who is fed by the male.
This species is occasionally a host of parasitic cuckoos, such as the common cuckoo (Cuculus canorus), but this is minimal because the common blackbird recognizes the adult of the parasitic species and its non-mimetic eggs. [45] In the UK, only three nests of 59,770 examined (0.005%) contained cuckoo eggs. [46]
Humans have a long history of eating eggs, both wild bird eggs and farm-raised bird eggs. [citation needed] Brood parasitism occurs in birds when one species lays its eggs in the nest of another. In some cases, the host's eggs are removed or eaten by the female, or expelled by her chick.
Oology (/ oʊ ˈ ɒ l ə dʒ i /; [1] also oölogy) is a branch of ornithology studying bird eggs, nests and breeding behaviour. The word is derived from the Greek oion, meaning egg. Oology can also refer to the hobby of collecting wild birds' eggs, sometimes called egg collecting, birdnesting or egging, which is now illegal in many ...
This species is a widespread summer migrant to Europe and Asia, and winters in Africa. It is a brood parasite, which means it lays eggs in the nests of other bird species, particularly of dunnocks, meadow pipits, and reed warblers. Although its eggs are larger than those of its hosts, the eggs in each type of host nest resemble the host's eggs.
Bird species admitted to the British List are those in BOU categories A, B or C: A: species that have been recorded in an apparently natural state at least once since 1 January 1950. B: species that were recorded in an apparently natural state at least once between 1 January 1800 and 31 December 1949, but have not been recorded subsequently.
Gannets are colonial breeders on islands and coasts, normally laying one chalky-blue egg. They lack brood patches and use their webbed feet to warm the eggs. [7] They reach maturity around 5 years of age. First-year birds are completely black, and subsequent subadult plumages show increasing amounts of white.
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