Reference for Chullin 12:1
שִׁלּוּחַ הַקֵּן, נוֹהֵג בָּאָרֶץ וּבְחוּצָה לָאָרֶץ, בִּפְנֵי הַבַּיִת וְשֶׁלֹּא בִפְנֵי הַבַּיִת, בְּחֻלִּין אֲבָל לֹא בְמֻקְדָּשִׁין. חֹמֶר בְּכִסּוּי הַדָּם מִשִּׁלּוּחַ הַקֵּן, שֶׁכִּסּוּי הַדָּם נוֹהֵג בְּחַיָּה וּבְעוֹף, בִּמְזֻמָּן וּבְשֶׁאֵינוֹ מְזֻמָּן. וְשִׁלּוּחַ הַקֵּן, אֵינוֹ נוֹהֵג אֶלָּא בְעוֹף, וְאֵינוֹ נוֹהֵג אֶלָּא בְשֶׁאֵינוֹ מְזֻמָּן. אֵיזֶהוּ שֶׁאֵינוֹ מְזֻמָּן. כְּגוֹן אַוָּזִין וְתַרְנְגוֹלִין שֶׁקִּנְּנוּ בְפַרְדֵּס. אֲבָל אִם קִנְּנוּ בְּבַיִת, וְכֵן יוֹנֵי הַרְדְּסִיאוֹת, פָּטוּר מִשִּׁלּוּחַ:
The precept of letting the parent bird, found in a nest, fly away (Deut. 22:6) is obligatory, in, and out of the Holy Land, during, and after the existence of the Temple, and applies to non-consecrated birds [חולין], but not to those which are consecrated sacrifices. The law is more rigid in respect to the obligation of covering the blood, than in that of letting the parent bird fly away, in as much as the first-mentioned precept applies to wild animals and fowl, whether ready at hand or not, and the latter applies to fowl only, and to those which are not ready at hand. By this latter expression is understood such as geese or fowls, which make their nest in an open field or orchard; but those which nestled within the house, or in respect to Herodian doves, this obligation does not apply.