What movie is this?

I've been trying to think of this movie's name all day long. It is an animated movie, probably by Disney.





There are 2 specific things I can remember about it. Early in the movie, there is a scene where a truck tips over in the forest, and spills a green poison everywhere.





The second scene I recall was later in the movie, a flying machine is built out of leaves.





The main characters were animals I believe. Any insight into this movie would be greatly appreciated.

What movie is this?
Once Upon a Forest (1993)





Wikipedia synopsis: ***SPOILERS***


In a beautiful forest called Dapplewood, there are many animals that live there. Four of them are Furlings (a term for animal children): the tomboyish woodmouse Abigail, the hungry hedgehog Russell, the brainy mole Edgar, and the adorable badger Michelle, who is the niece of their teacher Cornelius.


One day, in Furling Class, the four kids go on a nature ramble with Cornelius, which ends in a boat ride. At the end of the ramble, the Furlings go back to the forest to find out that it has been destroyed with poison gas. (A tanker truck blew a tire from a broken glass bottle, went off the road, and spilled a load of chlorine gas.)


A frightened Michelle goes into her house, only to breathe some of the gas and get sick. Abigail manages to save her, and the Furlings go to Cornelius' house nearby for shelter. There, Cornelius tells the Furlings that they need to fetch two herbs that can help Michelle--lungwort and eyebright. The Furlings head off for their journey the next day.


After encountering a hungry owl, a flock of religious wrens, and "Yellow Dragons" (better known as construction equipment), the Furlings make it to the faraway meadow with the herbs they need. After collecting some eyebright, the Furlings discover that the lungwort is on a giant cliff, out of reach. Suddenly, Russell gets an idea: the Furlings can use Cornelius' flying machine, the Flapper-Wing-a-Ma-Thing, to get to the lungwort.


After a memorable flight sequence, the Furlings manage to get the lungwort, and they steer the Flapper-Wing-a-Ma-Thing back for Dapplewood. They crash-land back in the forest after a storm, and bring the herbs to Michelle and Cornelius. After a group of humans (who have come to clean up the gas' mess) save Edgar from an old trap, the Furlings help Michelle get better; the next day, she wakes up from her coma. The Furlings' parents arrive as well, except for Michelle's mommy and daddy, who were killed in the gas accident.


TRIVIA:


Despite being made for children, it has a few things that might be considered a little too grave for the genre. For example, animals are shown being suffocated by poisonous fumes, and it is more than implied that a very large number do not survive.





The film's environmental theme was questioned by critics at the time of its release, along with the animation and story. It was not a commercial success, grossing only US$6.5 million domestically. To date, it remains the last theatrical feature to be produced under the Hanna-Barbera name.


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I saw bits and pieces of this film but never got to watch it all of the way through. When I arrived at Y!A late last year, I saw this question showing up fairly often and became familiar with the full story. So, I'm certain this is the film you're looking for. If you've seen it, the summary won't be a spoiler, just a reminder.
Reply:It's either Fern Gully or another movie about a Badger and whatnot. I don't remember there being a flying machine in the Badger one, but Fern Gully the faeries fly around on leaves to stop the Bull Dozers. I'll research the badger movie tho and see if I can't help you out a little more and edit my answer in a few okay?





I can't for the life of me think of the name of the second movie or even a context to put it in so that I could narrow down my search. Sorry. I think it really could be Fern Gully tho.





The girl underneath me Mystmoon something got what movie I was talking about with the badgers (or whatever they were GOOD JOB!!) She needs best answer in this one. That's definitely the movie you were thinking of!!
Reply:your first clue sounds like fern gully but the second one kinda sounds like its a bug life but they build a bird out of leaves but im not sure what movie u r thinking of


i looked up the once upon a forest and on the cover they are flying in something that looks like it maybe made of leaves go to yahoo movies and look it up see if it looks right
Reply:Fern Gully or maybe the Rescuers?? Was there a birds nest? Cuz that is deff the Rescuers
Reply:i think the movie is ants!
Reply:Ants?
Reply:Fern Gully maybe?