I recently started a full-time babysitting job and the family has a pet macaw. I've never really been around birds before and I'm interested in a lot of her body language, and what it all means. The bird is named Lucy. She seems very protective of the family, she threatens to bite anyone that's not the mother. Aside from that, though, she seems to like attention. When she hears/sees me in the room, she squawks really loudly, I'm guessing it's to get my attention. If I go over to the cage and look at her or talk to her, she stops squawking. Sometime she'll just turn her head sideways to look at me. I read somewhere that if their pupils dilate it means they're ready to attack. Her pupils don't dilate when she looks at me, though, they actually sometimes get smaller. Usually if I talk to her, she'll talk back. Each time I'm at the house, she has more and more things to say. At first it was only "hello," but on different occasions over the past couple of weeks she's said "hello, goodbye, goodnight, hi, hahaha, how are you," and for the first time this morning, "i love you". Does her growing vocabulary mean that she's becoming more comfortable around me? She's also recently started taking treats from my hand without threatening to bite. Another thing that she does is sort of bob her head while looking at me. She'll do it once or twice and then stare at me until I react, then she'll do it again. Sometimes she'll even start "dancing," sort of rocking her body side to side. Some noises she's made include tongue clicking and a sort of cooing noise. That's all the body language/noises from Lucy that I can really think of right now. If someone could help me figure out what it all means and how she feels about me, I would be very grateful. I'm just very interested as I love animals and I've never really associated with birds before. 
