Birds have a few adaptations and behaviors to keep their legs warm in cold weather:
Blood vessels (veins and arteries) run very close together or are intertwined:
The arteries and veins intertwine in the legs, so heat can be transferred from arteries
back to veins before reaching the feet. Such a mechanism is called countercurrent exchange. Gulls can ...
You're right, snakes rely on scent to capture their prey. The fact that snakes are carnivores may be the one constant among all snake species; absolutely none feed even partially on plant matter. So if plant matter is found in their feces, it must have gotten there accidentally.
Here, check out this post, which answers your question perfectly:
In most ...