Without Animals Green plants wouldn't have several things 
to reproduce and modify in the changing climate.  First 
there is the animals eat the fruit and spread the seeds in 
which helps new plants greo, other than droping to the 
ground and getting strangled by currently living plants.  
second Animal bodies contain a great concentration of 
nutrients and minerals in which fertalize the ground by 
their fecal matter and the dead bodies.  third they bring 
seeds of one spies distances that there would be no way in 
which the plants coud spread giving greater chance for 
genetic diversity which helps plants survive.

some birds are carriers of pollen grains