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During the late 1990s, Aves was most commonly defined phylogenetically as all descendants of the most recent common ancestor of modern birds and Archaeopteryx lithographica.

Although there is a vast amount of evidence showing how caring for a child with SMI can negatively impact a parent’s psychological health, there is scant clinical evidence highlighting the deleterious physiological effects to the caregiver. Barker of the Waisman Center at the University of Wisconsin-Madison addressed this specific dynamic in a recent study by examining the cortisol levels in individuals charged with the care of adult children with SMI.

Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in flightless birds, including ratites, penguins, and diverse endemic island species of birds.

The digestive and respiratory systems of birds are also uniquely adapted for flight.

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

They are usually laid in a nest and incubated by the parents.

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Birds are the closest living relatives of crocodilians.

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