I took these pictures last weekend and my second sister’s Lovebirds have grown. They are about 5 or 6 month old now and it’s hard to tell if they are male or female. According to Wikipedia, determining Lovebird sex is difficult. At maturity of one year, it may show signs of whether it is male or female, such as ripping up paper and stuffing it into its feathers (female behavior) or regurgitating for its owners (male behavior: the male feeds the nesting female). This behavior is not a reliable indicator. The only sure method is DNA testing, companies that provide such service exist. Source.
I’m not sure how one out of a group of 4 lovebirds is yellow.
Mini is a parakeet, he is about 20 year old. His feathers start to grow back now, he was shedding real bad last month. Mimi understands and speaks a little Chinese by the way.