Is it a boy thing?

This morning we were driving home from dropping of Hubby's dry cleaning. Part of the way is a winding road with lots of land and trees. Kangaroos are often seen amongst the bush. My eldest son was looking out of his open window and commenting how cold the wind was. Then he shouts "Oh, Oh, Oh"
"What?" I say, (and not in the concerned way, but the annoyed 'Guh, what now' way)

"A dead Kangaroo on the side of the road" He says, a little too excitedly, to which younger brother in the back says
"Where, where is it? I can't see it" "I miss all the cool stuff"

Older brother says "Don't worry if I see another one I'll tell you straight away"