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The level of divergence is the highest of any genus of birds, being more typical of the divergence between genera or even families. The northern potoo was for a long time considered to be the same species as the common potoo , but the two species have now been separated on the basis of their calls .
Studies of stomach contents have shown the potto diet consists of about 65% fruit, 21% tree gums and 10% insects. [21] Pottos have also occasionally been known to catch bats and small birds. [ 22 ] Their strong jaws enable it to eat fruits and lumps of dried gum that are too tough for other tree-dwellers.
Potoos lay their eggs in December to begin their roughly 51-day nesting period, one of the longest nesting periods for birds their size. [23] Young potoos hatch after about 33 days, using their egg tooth to break free and emerge as downy individuals with pale brown and white stripes. [23] [21] The hatchling is fed by regurgitation. Parents ...
Birds swallow food and store it in their crop if necessary. Then the food passes into their glandular stomach, also called the proventriculus, which is also sometimes referred to as the true stomach. This is the secretory part of the stomach. Then the food passes into the gizzard (also known as the muscular stomach or ventriculus).
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The proventriculus is a standard part of avian anatomy, and is a rod shaped organ, located between the esophagus and the gizzard of most birds. [2] It is generally a glandular part of the stomach that may store and/or commence digestion of food before it progresses to the gizzard. [3]
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