The Lion's Busy is a 1950 Warner Bros. Looney Tunes cartoon written by Tedd Pierce and directed by Friz Freleng.
Leo the Lion (who now speaks with an Irish accent in this cartoon), on his tenth birthday, receives a book as a present, and after finding out that lions rarely live beyond ten years, a hungry Beaky Buzzard, who turns out to be the one who had sent the book to him in the first place, takes the chance to eat him for his meal.
What follows is a series of attempts by Beaky to eat Leo, starting with making him slip off a cliff using a banana peel to try and kill him.
Beaky proceeds to catch the lion in a roasting pan and, while Leo is dazed, starts to prepare him for dinner.
But Beaky evades every swing and takes cover up in a tree, which Leo tries to climb to reach the buzzard and try to beat him up.