Sarcastic Fringehead (Neoclinus blanchardi)
When two fringeheads have a territorial battle, they wrestle by pressing their distended mouths against each other, as if they were kissing. This allows them to determine which is the larger fish, which establishes dominance
Traumatic cyst of the anterior mandible in a young male.
Also called “solitary bone cyst” & “traumatic bone cyst”. Histologically, signs of trauma (haemosiderin) can be seen in the bland connective tissue lining the syst. The radiology is typical.