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Rufous collared sparrow

Zonotricha capensis

Description:

This bird is very well known for it's diverse vocalisations.Being non migratory it's body uses several tactics for thermoregulation. The Rufous-collared sparrow relies entirely on its kidneys for osmoregulation and ionoregulation. It is able to tolerate a wide range of salt intake despite lacking a salt gland, however the metabolic cost in energy is too great to maintain the necessary osmoregulatory processes for an extended period of time. As a result, the Rufous-collared sparrow tends not to inhabit marine environments such as salt marshes. Under conditions of higher salt intake, the mass of the kidney and heart can increase up to 20%. This response in organ size causes an increase in basal metabolic rate (BMR) by up to 30%. Kidney size is also affected by the amount of water available in the environment. In arid environments, the urine is more highly concentrated, and the kidneys tend to be smaller than in wetter environments.

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3 Comments

Hema
Hema 2 years ago

Thanks Lauren. Did you read about how it uses its kidneys for osmoregulation?

LaurenZarate
LaurenZarate 2 years ago

I love this little bird. It is migratory here in Chiapas. It comes in late spring and leaves in the fall. It has the loveliest little call and the first one I hear every year makes me happy. It is also the Andean Sparrow I think.

Hema
Hema 2 years ago

Also known as Chincolas.

Hema
Spotted by
Hema

Biolley, Provincia Limón, Costa Rica

Spotted on Jul 12, 2018
Submitted on Jul 12, 2018

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