Some are shy and sweet, while the silly ones will put on quite a show. Male canaries in particular will break into a chorus of cheerful melodies. Females like to chill out a little more, and may only peep or warble. Most canaries don't like to share the same cage, so it's best to keep just one. Some females can get along, but males will fight.
Cockatiels love to climb on their cages and play with hanging toys.
These movers and shakers prefer tall cages, so they can climb up to the highest perch. Female cockatiels are real sweeties, while their male counterparts are loud chirpers who can be taught to speak. Both males and females love attention, so you should spend lots of time with them.