Welcome to BYC, Lisa! 
Glad you joined us! I'm from MA too!

Glad you joined us! I'm from MA too!
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Welcome to the forum. Your chickens will love living on such nice land with vegies and flowers. So glad you're here. I'm new too. Welcome!!I am new to owning chickens. I just got my chicks last Saturday, and I already have fallen in love with them.
I have 6 black Australorp chicks all supposed to be pullets, but I think I might have a roo or two!
I think chickens are great birds with their own little personalities. I also love the idea of getting fresh eggs and knowing where they came from.
Along with chicken's, I enjoy vegetable and flower gardening. I have a two acre lot so I am able to grow a good amount of food. The chickens will be a great addition with their eggs.
I share this amazing experience with my two kids and husband. We all work together and its a great way to spend our days together. We also have two Guinea pigs and two Chinchillas.
I am grateful to have found BYC because on Monday because one of our little Australorp's was putting her head between her legs and running backwards. I was alarmed and immediately started searching for what it could be. The first place that popped up was BYC. Here I found some great info that gave me insight on what was wrong and how to treat her. On top of that, I was so happy to see the support everyone had for each other and how they shared stories of thier own experiences.
Seeing this, I decided if I'm going to own chicken's, I definitely want to be a part of such a supportive and informative community.![]()
Behavior isn't really an indicator in chicks, They all have different personalities. Cockerels are actually usually the calmest and friendliest as chicks, and aggressive or protective behavior doesn't start happening until after they start crowing or mating, 5-8 months or more. Even pullets will chest bump and juveniles of both genders act all crazy when their hormones start kicking in.
Pecking is a normal behavior, I'm pretty sure they're just curious. I don't know how old your chicks are, but it looks like they're just starting to get feathers and they're probably just testing their wings and bravery and other abilities. They get pretty rambunctious at a couple weeks old and start flying everywhere too.
If you're still concerned about your other sick chick, you could start a new thread and post some pics of her on this other forum:
https://www.backyardchickens.com/forums/emergencies-diseases-injuries-and-cures.10/
Have fun with your flock, no need to worry about gender just yet!