This is the full opening song to the Japanese version of the anime Dinosaur King.
The song is 小さな僕らの大きなハート (Chiisa na Bokura no Ooki na Heart) by ICHIKO.
Song information is from the Dinosaur King Anime News Network page: http://www.animenewsnetwork.com/encyclopedia/anime.php?id=7519
The Dinosaur King cast picture is from: http://www.nagoyatv.com/kyoryu/index.sms
Dinosaur King is currently airing in America on 4Kids TV: http://www.4kids.tv/show/dinoking
Other interesting Dinosaur King links:
Appears on these pages
Chiisa na Bokura no Ooki na Heart (小さな僕らの大きなハート) was the first opening for the Dinosaur King...