This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鸐 combines 翟 (a type of pheasant) with 鳥 (bird), likely referring to a specific bird, possibly the copper pheasant. The exact historical development is uncertain.
The left side 翟 suggests a long-tailed bird, and the right side 鳥 explicitly means bird. Together they reinforce the idea of a bird, but the specific meaning is unclear.
For テキ, imagine a rare bird that makes a soft 'teki' sound when it pecks at a tree: teki -> テキ.