For C3/DS all you have to do is hold shift + right click to pick up a creature. In C3 standalone you'll need to find a powerup to do this (it's in the Aquatic Terrarium), but it's enabled by default in DS.
You will need a COB for C1 and C2 to do that, but I don't know where they can be found off the top of my head unfortunately.
I liked some of the seeyou7 breeds like the Estrella, Nenya, and Primavera norns... unfortunately, it seems I only have the Nenya norns saved on an old hard drive. Seeyou7 is gone, and the wayback machine does not have these breeds archived as far as I can tell. The only other place I remember seeing them was Creatures Unlimited, which is also down.
Are they possibly being hosted somewhere else? To clarify, I am looking for all of the breeds originally hosted there from that pack of sorts:
If no one is hosting them but has the files, I can provide an email you can send them to, if you would not mind.
Likewise, I have the nenya norns should anyone want them.