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The leg arrangement of passerine birds contains a special adaptation for perching.

A tendon in the rear of the leg running from the underside of the toes to the muscle behind the tibiotarsus will automatically be pulled and tighten when the leg bends, causing the foot to curl and become stiff when the bird lands on a branch.

The later experienced a great radiation of forms out of the Australian continent.

A major branch of the Passeri, parvorder Passerida, expanded deep into Eurasia and Africa, where a further explosive radiation of new lineages occurred.

Sometimes known as perching birds or, less accurately, as songbirds, the passerines form one of the most diverse terrestrial vertebrate orders, with over 6,000 identified species.

The initial split was between the New Zealand wrens (Acanthisittidae) and all other passerines, and the second split involved the Tyranni (suboscines) and the Passeri (oscines or songbirds).The hind toe joins the leg at the same level as the front toes.The passeriformes have this toe arrangement in common with hunting birds like eagles and falcons.The acanthisittids or New Zealand wrens are tiny birds restricted to New Zealand, at least in modern times; they were long placed in Passeri; their taxonomic position is uncertain, although they seem to be a distinct and very ancient group.Most passerines are smaller than typical members of other avian orders.

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    The timing of the first signal of double potentials was the same as that of the potential recorded in LAA (for the left PVs) or in the SVC (for the right PVs) either during LAA/ SVC pacing or in sinus rhythm.