Plants are classed as animals, as they're living things. It's the same as the fact that humans are animals, too. So any living thing like a tree, plant, worm etc.
Animals don't head towards a burning bush fire, that's for sure.
All creatures have a head of some sort.
There are animals with multiple heads, a condition called congenital cephalic disorder.
goatsoxensheepramsdeerelkelephants
crab
Animals that have two heads? There are very rare two-headed snakes, I know that for sure. Maybe some mythical animals, like dragons, have two heads.
frogs
Larger animals have smaller eyes relative to their heads. Likewise, smaller animals have larger eyes relative to their heads.
there just like human
they have adapted to have light from their heads
It means to fight - lots of male animals butt heads when they fight, such as goats and sheep and deer. You also hear the same term used: "butt heads" instead of "knock heads."
people; they have addapted by growing fur animals: have develped exta heads
because they are big animals
Some animals have almost invisible hole on the side of their heads. Other animals have ears as you know. Frogs and Toads, like your category suggests, have little holes in the sides of their heads.