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.]
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]