Is this a leghorn or a cornish cross?

[MosswoodChickens]

It may well be a mix of something, but I'm curious as I'm finding out CC's don't live long.
The first pic was when he (now named Theo lol) was about 3 weeks. The second one is this week but it's harder to see - sorry. He's a lot bigger than my other three chicks, but they aren't all the same breeds, either - all barnyard mixes, afaik.

TIA!

 

[ChickenCanoe]

It isn't a Cornish Cross.
It may not be a pure bred white Leghorn but there are many breeds that come in the white variety. While those are the two most common white chickens, I can think of about 20 other breeds that come in white.

Here are Cornish/Rock crosses.
http://www.feathersite.com/Poultry/CGA/Broil/BRKMeat.html
Here are Leghorns.
http://www.feathersite.com/Poultry/CGK/Leghorns/BRKLeghorns.html

 

[FluffyBottomBantams]

I agree with chicken canoe He could just be bigger because he’s a dude. Cornish are weird shaped very stocky and broad chested.

 

[Severne]

Definitely not CX as the others said.

 

[FluffyBottomBantams]

Love your avatar picture! Eggs are neat

 

[MrFluffyandGirls]

Looks like a leghorn minus the very yellow legs. So maybe a leghorn cross?

 

[MosswoodChickens]

Oh good. After looking at the links Chicken Canoe posted I'm really glad he isn't a Cornish! I know they have their purpose but it just looks so painful to me!