ClipArt ETC
The twig of a thorn-tree. Most thorns point downward.

Thorn-Tree Twig

The twig of a thorn-tree. Most thorns point downward.

The image shows a cow grazing on a thorn-tree. A cow and many other animals graze with their tongue going from underneath the plant. That is why the thorn-tree's thorns have adapted to point mostly downward for protection.

Cow Grazing on a Thorn-Tree

The image shows a cow grazing on a thorn-tree. A cow and many other animals graze with their tongue…