Kibbekee fauna

These are some species I made up for a potential novel. They're all from a planet that has a day/night cycle that is about four or so Earth years so everything is in a constant migration around the planet running from the cold nights and the hot days. This leads to a lack of biodiversity compared to Earth.
The three canine-like heads are three different races of the sentient species on the planet. I've drawn them before. The top one migrates in the dawn period on the planet. The darker brown type migrates in the evening period on the planet while the dark saber-toothed species doesn't migrate since they store up food and live underground through the day and the night period.
The winged species near the top is a mount. They are huge and can carry two riders without much trouble.
The birds, which have pouches to carry their young and eggs on migration, are also used as mounts. I'd thought I got the head too big until I looked up the extinct terror birds and then, I realized the head wasn't that big.
The huge green creature is a kind of reptile and they eat pretty much any kind of plant matter. Sometimes, the intelligent creatures will ride in their backs but they're not really a mount since they're so large they can't be controlled easily. The thing on the nose is used to grab stuff but it isn't like an elephant's trunk since it doesn't have nostrils in the end of it.
The little snake bird thing is just a species of small predator/scavenger.
The last two species are just random ones I drew to add a few more species. I figure the reddish one is a predator while the gray one is a herbivore. The carnivore is meant to have very strong bone crushing jaws.
I used a bunch of 's brushes for this.