Linked from
The 13 pages that link to Syndactyly, each with the reason it gives.
DiprotodontiaRelated: Many diprotodontians have fused second and third toes on the hind foot.
Limb developmentRelated: It can result when tissue between developing digits fails to regress fully.
Apert syndromeNarrower topic: Apert syndrome causes complex syndactyly involving the hands and feet.
FingerCompared with: It contrasts with the usual separation between fingers.
Smith–Lemli–Opitz syndromeRelated: Fusion of the second and third toes is a frequent clinical clue.