During puberty: After infancy, the tween and teen years are the period of most rapid change. For girls, the growth spurt begins between 10 and 11 and lasts until around 15; for boys, it starts about two years later and lasts until age 17 or so. Girls typically stop growing about three years after they've had their first period, but boys continue to grow throughout their teens.
Parrots have thick tongues, so they don't need lips to approximate human sounds. The tongue's thickness, and where a parrot positions it in his mouth, allows him to imitate human speech. When air passes through the syrinx, the parrot moves his tongue to produce sound in his throat and mouth.
The bird-voiced treefrog (Hyla avivoca) is a relatively small, tree-dwelling amphibian which is named for its distinctive, bird-like call. Given by the male, this call consists of a series of high-pitched, whistled â whit, whit, whit â notes, which are repeated several times. The bird-voiced treefrog inhabits forested swamps and wetlands and spends most of its time in the trees. 2  The bird-voiced treefrog uses its limbs to wipe a layer of mucous over its body, which helps to prevent it drying out.