Indeed, and if the size is still too big, you can give them the bird's girth and length measurements, and they'll make one to fit those measurements exactly.

I dont know how to measure birds and I havent got a measuring thingy if it is too big ill just sew it.

On the website's FAQ, it tells you how to measure. If you don't have a measuring tape, then you can use a ribbon, mark said ribbon with a pencil, and measure it with a ruler.

Yeah I know I would rather just sew it im sure it would fit anyway.