While it may be more common in this day and age to refer to little animals as “babies,” the slightly more academic terms “young” and “juvenile” were used by Thomas Sadler Roberts when he noted the age of the birds that he photographed/studied. The juvenile Cooper’s Hawks below are the definition of “not fully grown or developed” as they appear to be photographed at just the right moment prior to falling over due to the inability to support their own weight. The young Red-tailed Hawks, photographed while still in the nest, look a bit more comfortable:

– Cooper’s Hawks, four juvenile, Warren, June 29, 1900

– Red-tailed Hawks, 1924