Kenneth F. Higgins 1969 <p>Bursa of Fabricius depths of 88 lesser snow geese (<i>Anser c. caerulescens</i>) and 69 small Canada geese (<i>Branta canadensis</i> <i>hutchinsii/parvipes</i> complex) were measured. Bursal depths were unreliable indicators of age-classes of lesser snow geese and small Canada geese; previously, the same had been found to be true for large Canada geese (<i>B. c. interior</i>). Regression in size or closure of the bursa first occurred at 17-20 months of age (yearlings) in lesser snow geese and small Canada geese, but at 29-32 months of age (2-year-olds) in large Canada geese.</p> application/pdf 10.2307/3799338 en Wiley Bursal depths of lesser snow and small Canada geese article