Two Drakh
One thing that has always confused me with the Babylon 5 series and the Crusade series is that there are two types of Drakh creatures. The first one was introduced in B5 season 4 as a swishy, out-of-focus, out-of-sync creature with big eyes and a bug-like head. Then later we are shown a more humanoid creature with horn-like appendages on its head and small eyes and mouth. I have copied screen grabs of both versions together in the same TV shot, so there must be a reason why there are two different creatures. I have searched many fan websites and blogs and boards to find the answer, but so far I have come up blank.
What is the purpose behind the two different versions of the Drakh?