At Savatthi. "Bhikkhus, there are these four modes of generation of supannas. What four? Supannas as born from eggs, supannas born from the womb, supannas born from moisture, supannas of spontaneous birth. These are the four modes of generation of supannas."
(Phoenixes may be born from eggs, the womb, moisture, or spontaneously.)
SN 30.2 Haranti Sutta: They Carry Off
At Savatthi. "Bhikkhus, there are these four modes of generation of supannas ... . "
"Therein, bhikkhus, egg-born supannas carry off only nagas that are egg-born, not those that are womb-born, moisture-born, or spontaneously born. Womb-born supannas carry off nagas that are egg-born and womb-born, but not those that are moisture-born or spontaneously born. Moisture-born supannas carry off nagas that are egg-born, womb-born, and moisture-born, but not those that are spontaneously born. Spontaneously born supannas carry off nagas that are egg-born, womb-born, moisture-born, and spontaneously born. "
"These, bhikkhus, are the four modes of generation of supannas."
(Phoenixes may be born from eggs, the womb, moisture, or spontaneously. Each of them may carry off a dragon of lower birth.)
SN 30.3 Dvayakārī Sutta: Ambivalent (1)
At Savatthi . . .. Sitting to one side, that bhikkhu said to the Blessed One: "Venerable sir, what is the cause and reason why someone here, with the breakup of the body, after death, is reborn in the company of egg-born supannas?"
"Here, bhikkhu, someone acts ambivalently in body, speech, and mind. He has heard: 'Egg-born supannas are long-lived, beautiful, and abound in happiness.' He thinks: 'Oh, with the breakup of the body, after death, may I be reborn in the company of egg-born supannas!' Then, with the breakup of the body, after death, he is reborn in the company of egg-born supannas. This, bhikkhus, is the cause and reason why someone here, with the breakup of the body, after death, is reborn in the company of egg-born supannas."
(One becomes an egg born phoenix due to ambivalent deeds in a past life and the appropriate aspiration.)
SN 30.4-6 Dutiyādidvayakārīsuttattika: Ambivalent (2-4)
(The same is repeated for the other three types of supannas.)
(One becomes a womb born, moisture born, or spontaneously born phoenix due to ambivalent deeds in a past life and the appropriate aspiration.)
SN 30.7-16 Aṇḍajadānūpakārasuttadasaka: With the Support of Giving (1)
Sitting to one side, that bhikkhu said to the Blessed One: "Venerable sir, what is the cause and reason why someone here, with the breakup of the body, after death, is reborn in the company of egg-born supannas?"
"Here, bhikkhu, someone acts ambivalently in body, speech, and mind. He has heard: 'Egg-born supannas are long-lived, beautiful, and abound in happiness.' He thinks: 'Oh, with the breakup of the body, after death, may I be reborn in the company of egg-born supannas!' He gives food ... . He gives drink .... He gives clothing .... He gives a vehicle .... He gives a garland .... He gives a fragrance .... He gives an unguent. . .. He gives a bed .... He gives a dwelling .... He gives a lamp. Then, with the breakup of the body, after death, he is reborn in the company of egg-born supannas."
"This, bhikkhus, is the cause and reason why someone here, with the breakup of the body, after death, is reborn in the company of egg-born supannas."
(One becomes an egg born phoenix due to ambivalent deeds in a past life, the appropriate aspiration, and giving various gifts.)
SN 30.17-46 Jalābujadānūpakāra Sutta: With the Support of Giving (2-4)
(These three decads each repeat the preceding decad for the other three types of supannas.)
(One becomes a womb born, moisture born, or spontaneously born phoenix due to ambivalent deeds in a past life, the appropriate aspiration, and giving various gifts)
References 1. www.accesstoinsight.org 2. https://suttacentral.net/ 3. The connected discourses of the Buddha (Bhikkhu Bodhi)