WATCHFUL by thefrie
The Ankole-Watusi is a breed of African cattle with enormous horns. Like many other animals with headgear, the horns are used for defense, mating, and to relieve their high body temperature. Blood is pumped into the honeycomb matrix inside their horns, where it is cooled off by wind.
The first photo is by Miloš Anděra.
Three cows (female cattle) in a fight by RLBarn on Flickr. They are only trying to establish dominance, not really hurt each other.
Mama and Calf from Beef Magazine.
Photo by Carol Beckwith and Angela Fisher.
Lurch set the world record for largest steer horns. They are 3 feet in circumference, 7 feet long, and 100 pounds each.
CT Woodie set the record for largest circumfrence of horns in a bull. His horns were uneven and in two out of the three photos I have seen of him, he was standing like that.
photos by mike roberts, masa ushioda, peter liu and doug perrine of green sea turtles being cleaned by yellow tangs, goldring surgeonfish and saddle wrasse. by feeding on the algea and parasites which grow on the turtle shells, the fish not only keep them clean, but reduce drag, helping the turtles to swim faster.
see also: butterflies drinking turtle tears
"I’ve never seen this beetle before. I was wondering if you had any idea? I found it right outside of Boston slowly climbing up a small brick wall. My finger is there for scale."-worstbird
Dr. Hogue, the entomologist at my university was kind enough to email me an ID for this beetle. According to Dr. H, if you are on the east coast it is likely to be a cetoniine scarab, Osmoderma eremicola.