Has very restricted distribution, on the Nevado Del Ruiz in the Central Andes of Colombia, where it occupies the páramo.
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We describe overlooked patterns and age-related variation in the iris coloration of the Red-bellied Grackle (Hypopyrrhus
pyrohypogaster), a range-restricted threatened species of the Colombian Andes. Whereas adults exhibit a bicolored paleyellow/scarlet red iris, juveniles show a dark iris, ranging from dark brown to grayish brown. In addition, we report the first
case for a Neotropical species of temporary heterochromia iridis, an uncommon phenomenon in birds, from recaptures of a
female Red-bellied Grackle in 2010. Our observations suggest that this case of heterochromia may be related to stress and
changes in blood flow to the eye.
As 2020 arrives, we have reached the end of a decade that saw lots of changes in the birdwatching community while the threats to the birds we love continue to become increasingly dire. Today, we’re taking a look back at the last 10 years in birding, and we’re doing so in three parts:
