Hedgehogs make great subjects for birthday card characters. I see them more frequently these days even in the US. Here are two colorful examples from the UK. I especially like the babies in the egg carton.
I bought these adorable hedgehog birthday cards with a special little girl in mind. Since she's not yet two, I have her birthday covered for a few years. The two larger cards are Hallmark, and the others I found in the UK. I love them!