I think Kam has more black feathers when you look at them from the back, that makes me think she's the oldest. 
Who would use the yellow bands?

It's hard to say which is older. They tend to loose their fluff after banding and they were also out in the rain the other day. That may have matted down her fluff a bit. The 2 girls hatched the same day so there isn't much difference. Blaze hatched 2 days later.

The yellow band is likely a domestic pigeon.

Debating who is biggest. Here it appears to be Zara, but she's still got way more fluff than Kanfai Malachim so that may be throwing the perspective off.

One other way to tell it's Nova - at least for the next week or so - she has already molted a few tail feathers. I noticed the gap in some of Pat's banding day photos. Here you can see the new ones growing in.

I totally forgot I had started gathering pictures for a collage showing the differences in the auricular patches of Nova & Neander. Let's see if it will post from disqus... nope. Can't log into flickr from here so I'll attach it instead.

In addition to the cere, 1 other identifier I use, which is not perfect and does steer me wrong on occasion - the lower edges of Nova's black hood are fairly sharp and distinct on both sides. She also has a strip of white extending back on the left side of her neck.
Neander has a bit of white fuzziness intruding into the edge of his hood on both sides. The fuzziness is sort of clover shaped.
Nova also has a darker head. And as is typical with raptors, the back edge of Nova's beak extends further back under her eye than Neander.

I'm adding this to the FAQ.

Thanks. I'll social post it when I get home.

They make me so nervous when they do this!

That is why we have the  emoji!

I totally forgot I had started gathering pictures for a collage showing the differences in the auricular patches of Nova & Neander. Let's see if it will post from disqus... nope. Can't log into flickr from here so I'll attach it instead.

In addition to the cere, 1 other identifier I use, which is not perfect and does steer me wrong on occasion - the lower edges of Nova's black hood are fairly sharp and distinct on both sides. She also has a strip of white extending back on the left side of her neck.
Neander has a bit of white fuzziness intruding into the edge of his hood on both sides. The fuzziness is sort of clover shaped.
Nova also has a darker head. And as is typical with raptors, the back edge of Nova's beak extends further back under her eye than Neander.

Nova's got her neck scrunched down like a heron

All lined up in size order!

Do we know which girl was #1, the largest eya? (Name)

I don't know. We'll have to ask those who were in the banding room if they could tell.

We may be able to tell once they un-huddle from the corner and can read their bands, but it was getting harder to tell which was biggest lately.

Eyases waiting in buckets for their turn!

Welcome Blaze...Zara...Kanfai Malachim!

Thank you for joining us this wonderful Banding day!

Kanfai Malachim

Zara

Blaze

And just like that they are back in the nest box!