There is nothing in the genesis a count that implies that there was a y long period of time between God's first act of creation and the creation of Adam.Until Adam, there were no creatures with a soul. The soul is what makes us different from animals. There's nothing to suggest that God cares about the life or death of animals or plants.
As for God care for animals, that he cares is seen in his command to Adam to care for creation a d in his commands about being responsible for one's livestock, that the beast of burden too rested on the safety etc etc.