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The American robin rejects cowbird eggs, so brood parasitism by the brown-headed cowbird is rare, and the parasite's chick does not often survive to fledging. [41] In a study of 105 juvenile robins, 77.1% were infected with endoparasites, Syngamus sp. being the most commonly encountered, in 57.1% of the birds. [42]
Because of high mortality in the first year of life, a robin has an average life expectancy of 1.1 years; however, once past its first year, life expectancy increases. One robin has been recorded as reaching 19 years of age. [39] A spell of very low temperatures in winter can, however, result in higher mortality rates. [40]
Cry4a levels in migratory birds, which rely on navigation for their survival, are highest during the spring and autumn migration periods, when navigation is most critical. [ 4 ] The Cry4a protein from the European robin , a migratory bird, is much more sensitive to magnetic fields than similar but not identical Cry4a from pigeons and chickens ...
Cape robin-chat (at right) feeding a red-chested cuckoo parasite chick. The Cape robin-chats are monogamous and highly territorial nesters. [19] A pair's territory usually comprises some fraction of a hectare, but its extent varies considerably depending on the habitat. [18] The nest site is within 5 feet (regularly 0 – 2 feet) from the ground.
The female scarlet robin has a more pronounced red flush to the breast and the spot on the forehead above the bill is more prominent and white rather than off-white. [13] The flame robin's calls are grouped into louder and quieter calls; the former can be heard from 150 m (490 ft) away, while the latter, which are often briefer, from 30 m (98 ...
A highly unusual animal. The distinctive extremities of the sea robins are actually extensions of their pectoral fins, said study coauthor Amy Herbert, a postdoctoral scholar in Kingsley’s lab ...
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The Japanese robin, along with the Ryukyu robin, can be traced back to 1835 when they were placed into one of the Coenraad Jacob Temminck's works under the name Erithacus akahige. After the 2006 molecular phylogenetic study, the species was placed into a clade under Larvivora , meaning "caterpillar eater," giving it half of its current ...