yes you can overeat on enything even fruit, overeating leads to obesity and being overweight. in order to prevent this listen to your body, if you feel unmfortabily full, you have eaten to much, if...
Yes, and be very careful to enusre they don't. Unlike mamals (like humans) a parakeet can't sweat. The best for them to cool down is to paint. (I think that is the wrong spelling, but you know what I...