- Having all the two flexor tendons for the toes bifid, the branches of one visiting the very first and second feet; those associated with other, toward 3rd and fourth toes.
- Having all the two flexor tendons of the feet bifid, the branches of just one going to the very first and second feet; those for the other, towards third and 4th feet. See Illust. in Append.
- In ornithology, strange when you look at the personality associated with flexor tendons inside sole of the foot; having that arrangement of the that is peculiar towards trogons or Heterodactyli, where all the flexors splits into two tendons, plus the flexor hallucis supplies the two posterior toes (very first and 2nd digits), as the flexor perforans supplies the 2 anterior feet.