All chicks on this planet

This morning the first two chicks that I saw were tall and skinny. From this exhaustive study we can conclude that all chicks on the planet are tall and skinny. Until this study was destroyed by the third chick. The third chick was short and skinny from this we can conclude that two-thirds of all the chicks on the planet are tall and skinny and one third of the chicks are short and skinny. There are no fat chicks on this planet. Thank you