There are times when Zeke goes out of his way to eat certain weeds. Even Tink had a period where she'd run out of the house and immediately chow down on the nearest stand of greens. The study of animal self-medication is called
zoopharmacognosy and is featured in this
New Scientist interview.
"The thing that surprised me most was discovering that sheep on the Isle of Foula in the Shetlands extract and eat the bones of live Arctic tern chicks." Indeed.