- The third book in the series will have your kiddos skip counting by twos in no time! Follow Sabretwooth Ruth on her Crazy Birthday Candle Jungle journey where twos are everywhere! Each birthday, a new candle two is added to her cake along with two new teeth in her smile. But wait! Two old Sabretwooth tiger teeth are MISSING !? (hmmm?) Look below! The Margin Varmints always have the birthday blocks turned in the bottom margin, ready for a quick lesson! The beautiful illustration is only outdone by Eric J Carter’s imagination. Your kiddo will discover something new each time the two of you read through it. Enjoy!