Could we consider Kollorak as a female Keelerak? Because the BIONICLE is usually lacking in female characters/creatures and seeing that a female Rahi could be as cunning (such as Krahka) or useful and loyal (such as Pewku) ally as a male Rahi (such as Keetongu), it would be reasonable that Sidorak chose a female Keelerak as his messenger/courier. It wasn't mentioned either Kollorak's gender in the novel or in the movie.
And, when Teridax recreated the Visorak Horde, did he recreate/revive Kollorak as well?
Also what's the gender of Jaller's Hahnah crab? It wasn't mentioned in any books.
And at least Kongu tamed a Gukko bird on Mata Nui and he called it "Ka". That Gukko was released as a set and featured in the MoL when Jaller & Takua travelled Ko-Wahi from Le-Wahi with Lewa Nuva. Also Ka helped Lewa when the Bohrok-Kal stole his symbol. If Kongu and Ka weren't there, Lewa would've been killed by now. So what's Ka's gender? Ka had a role in the old story.