What zodiac animals can Aquarius be?

Answer 1

Aquarius is the western Astrology sign of the water-bearer, who is usually depicted as a male human.

There's no restriction on what "animal" of the Chinese zodiac any western astrological sign can be, since the Chinese zodiac is based on year (approximately) and the Western zodiac is based on month (approximately). It's like asking "What years does December fall in?"