If you're looking for anime similar to Jungle Emperor Leo Special 2009, you might like these titles.
Unico is a special unicorn with the ability to make anyone he meets happy. But the gods are not pleased, and out of jealousy, they bid the West Wind to exile young Unico to the Hill of Oblivion, where he shall stay, alone, forever. Luckily, the West Wind is a kind soul and instead, hides Unico away from place to place, keeping him shielded from the eyes of the gods. Along the way, Unico must make new friends and even save the world from an evil power!
Ryosuke is determined; he will find Bagi, and he will kill her. He has been searching for her for five years, but has known her much longer than that. Ryosuke had been a lonely child, as his parents were away working most of the time. He was given a kitten that he took quickly to, despite the fact that she didn’t look or act quite 'normal'. He named her Bagi, and they lived as best friends… until everyone around started to notice how different she really was and so she was discarded. Now, over a decade later, word has spread that Bagi has been terrorizing villages deep in the South American jungles and leaving many dead. With the help of a young village boy, Ryosuke sets out to stop her, but will he really have the heart to take her life?
Both anime are based on characters created by Tezuka. In both anime, scientists interfere with nature in some way whether it is creating an enviroment (in JEL2009), creating mutants (in Bagi), or cloning (in both). Bagi is a bit darker (though JEL2009 has it's share of dark moments too). Still, if you like one then you might like the other.