Photography of Birds – Set # 130

Set # 130


Cooper’s Hawk


Cooper's Hawk

Cooper’s Hawk


Cooper’s hawks are fairly variable in size. There is usually minimal to no overlap in dimensions between the sexes, with females being considerably larger than males. On average, she may be about 20% larger linearly and around 40% heavier (though can be up to 125% more massive). More westerly Cooper’s hawks (roughly west of the Rocky mountains) show slightly less pronounced sexual dimorphism than hawks of the species elsewhere. Sexual dimorphism in Cooper’s hawks is most reliably measured by wing size, talon size, then body mass. Although there is some margin of error, within a given region dimensions of the two sexes never overlap in these regards (but may overlap marginally in tarsal and tail lengths). In general terms, Accipiter species are among the most sexually dimorphic in size of all raptorial birds.

Red-shouldered Hawk


Red-shouldered Hawk

Red-shouldered Hawk


An eastern population ranges west through southern Canada from southern New Brunswick and Ontario to the eastern edge of the U.S. Great Plains, south to Florida, the Gulf Coast, and eastern Mexico. Only northernmost populations are migratory. A western population breeds west of the Sierra Nevada from northern California to northern Baja California, and has recently expanded into Oregon and Arizona, and east of the Sierra Mountains in California.

© HJ Ruiz – Avian101

6 thoughts on “Photography of Birds – Set # 130

    • He’s watching me! Birds use both eyes when it’s figuring out the distance between their position to the subject they are looking at; doing that makes the quirky look possible.Thank you, my friend. 🙂

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: