Bird Term: Altricial

Today we'd like to share with you the meaning of the term altricial, especially as it relates to birds. It is the opposite of a term we shared earlier on the blog: precocial. Let's learn about what it means to be altricial!

The term altricial comes from the Latin alere, which means "to nurse, to rear, or to nourish." An altricial species is one in which the newly hatched or born young need to be cared for by their parents for an amount of time. While a precocial animal may be mobile and relatively independent within days or even hours of being born or hatched, an altricial species must rely on its parents to survive for a period of weeks, months, or even years before it is independent.

In birds, this means youngsters come out of the egg almost completely naked. They are relatively immobile, needing to stay in their nest, and some have closed eyes as well.

While having helpless babies may seem to be a disadvantage, there are advantages to this breeding strategy. Altrical eggs are smaller, relatively speaking, than precocial eggs, resulting in less biological stress to mother birds. Precocial animals are born or hatched with brains relatively large compared to their body size, but don't grow much as they mature. Altricial species are born or hatched with smaller brains which grow as the animal matures. In general, altricial species therefore "have a wider skill set" when they reach full maturity.

Most songbirds have altricial young, as do owls, hawks, herons, and woodpeckers. Rodents, cats, dogs, and humans also have altricial young, which rely on their parents for the first few weeks or decades of life, depending on the species and individual young.

Green Heron Chicks
Green Heron Chicks by South Florida Water Management District (CC BY-ND 2.0)
Baby Tree Swallows
Baby Tree Swallows in Nest by Virginia State Parks (CC BY 2.0)

Cute Green Heron & Tree Swallow Gifts

Comments

Be the first to comment

Comments with links or HTML will be deleted. Your comment will be published pending approval.
Your email address will not be published
You can unsubscribe from these communications at any time. For more information on how to unsubscribe, our privacy practices, and how we are committed to protecting and respecting your privacy, please review our Privacy Policy. By clicking submit below, you consent to allow Birdorable to store and process the personal information submitted above to provide you the content requested.

The Wood Thrush's double voice box

Today we have added a new species to Birdorable: the Wood Thrush. The Wood Thrush is a medium-sized songbird in the thrush family. Related birds include the familiar American Robin as well as the Blackbird of Europe....

European Robin Hood: A Birdorable Blend of Nature and Folklore

This week we're shining a spotlight on one of our newest designs, featuring our European Robin. The European Robin Hood design is a playful blend of nature and folklore, combining the cute charm of the European Robin with the legendary Robin Hood. This adorable...

2018 Bonanza Bird #2: Palila

Today our 2018 Bonanza continues with a Hawaiian species of honeycreeper: the Palila! Many species of Hawaiian honeycreeper are endangered or face threats, and the Palila is no different, unfortunately. The Palila is considered to be critically endangered, due in part to...

Urban Jungles: How Birds Thrive in City Settings

When we think about urban environments, images of bustling streets, towering skyscrapers, and dense human populations come to mind. Yet amidst this concrete jungle, a surprising array of bird species not only survive but thrive. Adapting to city life involves a fascinating blend of biological resilience and behavioral...