1) Yes, they will calm down and quit trying to eat you. Keeping them well fed while they are hrowing helps. I like to feed mine before handling so they calm down.
2) I'm not sure of the exact size with Colombians, but when it reaches a length of about 18-20", you should begin to tell the gender. The males will have small little bumps called spurs or buttons located on each side of the vent.
3) Agree with HM about live food other than insects.
4) Keeping together is specific for each set of animals. I have a pair of Colombians that live together and do well. My female B/W tegus wouldn't tolerate a room mate. I would introduce them in a neutral place and maybe add some fresh mulch in the new cage to give it a new start.
Welcome to the forum. That's a great story you have there!
Laura R (FL)
1.0.0 Colombian Tegu
1.4.0 Argentine B&W Tegu
1.2.0 Red Tegu
1.2.0 B/WxRed Tegu
1.0.0 Green Ameiva (yet another teiid)
7 other lizards
1 little gator
3 FL box turtle
1 Sulcata tortoise
16 snakes
5 fuzzy pets
4 little frogs
a bunch of creepy bugs
and a partridge in a pear tree
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