insessorial

in·ses·so·ri·al

 (ĭn′sĕ-sôr′ē-əl)
adj.
Perching or adapted for perching: insessorial claws.

[From New Latin Īnsessōrēs, the perchers (former order name), from Latin īnsessus, past participle of īnsidēre, to sit upon; see insidious.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

insessorial

(ˌɪnsɛˈsɔːrɪəl)
adj
1. (Zoology) (of feet or claws) adapted for perching
2. (Zoology) (of birds) having insessorial feet
[C19: from New Latin Insessōrēs birds that perch, from Latin: perchers, from insidēre to sit upon, from sedēre to sit]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
If a bird has insessorial feet, what is it adapted to do?
Specifically, volume 2 of "Go Up to the Hilltops" chronicles the years of the Russo-Japanese War (1905) and the subsequent turbulence in czarist Russia, World War I, and the concomitant prelude to Estonia's independence - all seen against the backdrop of the generational clash between Burnt Hill's insessorial old and autophagous young people.