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Many of these early "stem-birds", such as Archaeopteryx, were not yet capable of fully powered flight, and many retained primitive characteristics like toothy jaws in place of beaks, and long bony tails.which are more or less developed depending on the species; the only known groups without wings are the extinct moa and elephant birds.Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich.They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known as perching birds.Barker discovered that the cortisol awakening response (CAR) of the parents of adult children with SMI increased less significantly half an hour after they arose in the morning than the control group. Daily Stress and Cortisol Patterns in Parents of Adult Children with a Serious Mental Illness. Any views and opinions expressed are not necessarily shared by Good This suggests that the caregivers had a higher stress level upon waking than did the control group. Questions or concerns about the preceding article can be directed to the author or posted as a comment below.

Birds, especially those in the southern continents, survived this event and then migrated to other parts of the world while diversifying during periods of global cooling.The vast majority of bird species are socially monogamous (referring to social living arrangement, distinct from genetic monogamy), usually for one breeding season at a time, sometimes for years, but rarely for life.Other species have breeding systems that are polygynous (arrangement of one male with many females) or, rarely, polyandrous (arrangement of one female with many males).Additionally, Barker found that the cortisol levels of the caregivers declined less throughout the day than did the cortisol levels found in the parents of adult children who did not have SMI. “The fact that a similar pattern of hypoactivated daily cortisol in response to stress has been found across studies of parents of individuals with different diagnoses (i.e., schizophrenia, autism, developmental disabilities, and in the present analysis, SMI) and that used different measures of stress (i.e., behavioral problems of the adult child with the diagnosis, time spent with the adult child, and in the present analysis, daily stress not necessarily associated with the adult child) provides strong converging evidence for this effect,” Barker said.

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Birds produce offspring by laying eggs which are fertilised through sexual reproduction.

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