If it helps any, I heard that an estimated billion critters were killed during that month of fire,
but, and I'm going from memory here but am sure about the top and bottom figures....
Feral cats alone kill, every year:
300 million birds
500 million reptiles, amphibians and insects
1 000 million (a billion) mammals / marsupials
...
every year! That's just feral cats.
As is so often the case, we tend to hear about such events as the fires as part of a narrative, an agenda. Last year's were all about climate change. It wouldn't have helped the cause to state that more critters are killed
every year by a single introduced "species". There're 23 million wild pigs out there (introduced) that do a lot of damage too, and also other introduced animals such as foxes, rabbits, deer, wild horses, wild camels, cane toads (their poison kills just about anything that attempts to eat 'em) and God knows what else.
So yeah, a billion is shocking, but it happens
every year in addition to 300 million birds, plus the other half billion critters, and that's at the hand of one animal type alone.
You may or may not be surprised that I didn't hear a solitary mention of this context throughout that summer and since. I had to research this myself. He who accepts implied context from the LSM is doomed to delusion.