Hi everyone, I'm very new to chickens, and a month ago my husband and I bought two 11 week old lavender araucana pullets. They were still quite little, making cute peeping sounds and quite timid. Since then they've grown quite a lot, and have started to become quite aggressive. They sometimes wait until we turn away from them and then run after us, flapping their wings and pecking at our ankles. The most concerning thing, though, is that one of them has started to crow! 3 mornings in a row, between 6 - 7, it has crowed loudly and repeatedly. It is a bit off tune but it's definitely a cock-a-doodle-do! Should we know by the age of 15 weeks whether they are roosters or not? Can a hen spontaneously start crowing? I will try to post a photo... Thanks for any help or ideas, very much appreciated!