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“Our observations are among the most extensive of a bilateral gynandromorph bird in the wild”, Professor Peer and Mr Motz write in their paper.
The team report that the cardinal never appeared to pair up, nor did they ever hear it sing. Nor did the bird respond aggressively to recorded Northern cardinal songs that were played to it. Yet despite this bird’s seemingly solitary and silent life and bizarre appearance, Professor Peer and Mr Motz never observed its flock mates behaving aggressively towards it.
In halfsider birds, cells on each side of the fused embryo develop based on their chromosomal makeup, regardless of the hormonal milieu. In contrast, human embryos develop based upon the hormonal milieu that their cells are exposed to. For this reason, gynandromorphism doesn’t occur in humans or other mammals. In addition to birds, bilateral gynadromorphs sometimes pop up in a variety of spineless creatures (crustaceans, arachnids, and insects).