The animals might be very confused. Some could run away in fear. For example, the deer in the forest would dash through the trees, trying to find a safe place far from the alien invaders.
Some animals would hide. Mice would scurry into their holes and stay there until they think it's safe.
I think 'Independence Day' is also very popular. The idea of a global coordinated effort to fight off the aliens is really exciting. And the huge alien ships hovering over major cities is a very memorable image from both the movie and the novel. Additionally, 'The Invasion of the Body Snatchers' has a certain popularity because of its creepy concept of the aliens taking over humans without them even realizing it at first.
One possible plot could be that aliens invade Hogwarts. They might be attracted by the powerful magic there. The students and teachers would have to put aside their differences within the wizarding world and unite against the alien threat. Harry Potter and his friends could use their knowledge of magic, like defensive spells, to fend off the aliens.
First, a great alien invasion book needs a unique concept for the aliens. For example, in 'The War of the Worlds', the Martians are technologically superior and have a completely different biology. Second, it should have engaging characters. In 'Ender's Game', Ender is a complex and relatable character that draws you into the story. Third, the plot should be full of tension. 'The Day of the Triffids' keeps you on the edge of your seat as the triffids are slowly taking over the world.
One possible forest animals Christmas story could be that a group of animals find an old box in the forest. Inside the box, there are some shiny Christmas ornaments that were lost by a human family who used to come to the forest for picnics. A curious fox named Felix discovers how to hang them on the low - hanging branches. The other animals like the chipmunks, the raccoons and the mice all join in. They create a wonderful Christmas - like area in the forest. Then on Christmas night, they see a bright star above the forest and they believe it's a special sign for their forest Christmas celebration.
During an animals meeting story, they could be discussing how to protect their habitat. For example, birds might meet to talk about building nests in a safer place away from predators.
In this story, there could be a lot of chaos. For example, a curious cat might go into a dog's house. The dog could be very surprised and start barking, while the cat might be scared and hiss. It could lead to a comical chase inside the dog's house.
One key feature is the sudden appearance of the aliens. They come without much warning, like in 'The War of the Worlds' where the Martians just start attacking. Another is the technological gap. The aliens always seem to have much better tech than humans.
There could be an alien race that has a very different ideology from the people of Remnant. For example, they believe in a survival - of - the - fittest concept at an extreme level. Their leader, who enforces this ideology and leads the invasion, would be the main antagonist. RWBY would have to oppose this leader's cruel ways and protect their own values.
First, you need to create unique and threatening aliens. Make them have advanced technology or special abilities. Then, build a believable world and characters that people can relate to. Also, have a clear plot with escalating tension and unexpected twists.