
1) Animal order 2) Order insessores 3) Percher 4) Perching bird
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https://www.crosswordclues.com/clue/insessores

• (pl. ) of Insessor • (n. pl.) An order of birds, formerly established to include the perching birds, but now generally regarded as an artificial group.
Found on
http://thinkexist.com/dictionary/meaning/insessores/
In`ses·so'res noun plural [ New Latin , from Latin
insessor , lit., one who sits down, from
incidere . See
Insession .]
(Zoology) An order of birds, formerly established to include the perching birds, but now generally regarded as an artificial group.
Found on
http://www.encyclo.co.uk/webster/I/68

In ornithology, the insessores are the perchers or passerine birds, an extensive order or division, comprehending many birds which live habitually among trees, and have the toes three before and one behind, and specially adapted for perching. These birds generally display great art in the construction of their nests. In them the organ of the voice ...
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http://www.probertencyclopaedia.com/browse/BI.HTM

[
n] - a bird with feet adapted for perching (as on tree branches)
Found on
http://www.webdictionary.co.uk/definition.php?query=Insessores
order Insessores noun a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.