Rarer pets are CS, or Credit Shop pets (Where you purchase eggs with real money). Seasonal pets are also quite rare; you may get their eggs through egg hunts that occur at holidays (Christmas, Easter, Halloween, and Valentines Day).
Stocks are another way to earn money; just like the real stock exchange.
You must buy wings in order to put them on your character (Which can be kinda expensive at times ouo')
If you have any other questions, feel free to rmail me, or refer to FAQ (Frequently Asked Questions). You may also go here to get a mentor to help you through the site. :)