So, are you ever going to answer that reproduction question I ask a while back or is it just too much of a hassle in balancing between NSFW and SFW?
If you don’t mind a strictly text answer, cause the reality is that it would end up being unnecessary sexual diagrams (I don’t consider it to be relevant to Sonar’s story and much more simple to explain for Abydos, because it’s not prominent in the story-telling).
As for Sonar being mammalian with partial avian characteristics…she’s by all accounts a “mutt”. Fennec father and Osprey mother, conceived and born in live mammalian fashion; likely the 9mo gestation period like humanoids etc. Within Iris’ universe, where she is currently “cameo’ing”, the fact of the matter makes her socially unacceptable; mix breeds are considered lower class, not pure.
Within Abydos’ world, only reptiles have evolved to humanoid anthro forms. While they give live mammalian birth, they have small ‘clutches’ of essentially premature babies- that the entire village makes an effort to care for. Which is why reproduction is a privilege, not a right (also why most of the working class females, especially Guardians, are banned from sexual relations to avoid distraction and maintain economic stability). In means of reproductive organs- they’re primarily reptilian actually. Males have retractable penis (only one for majority of bipedal species) that is hidden unless aroused. Females do not breastfeed, thus have small and/or non-existent mammaries as well. The pregnancy gestation period is roughly 6mo (spanning usually October to March since breeding season is mid-fall). Cross-specie breeding is tremendously dangerous on both a molecular level (deformities, sterility) and potential social exile …or execution!