Ravens are creepily intelligent and self confident. Several years ago, while doing yard work, I noticed a large raven land on the roof of my truck. I was concerned it would scratch the roof and attempted to shoo it away by waving a large broom overhead while walking toward the truck. To my surprise, the raven did not fly away as anticipated. As I got closer, my pace slowed and my concern grew - why was this bird not afraid of me? Once I got right next to the truck, I gently pushed the broom against the raven. Instead of finally flying off, the raven leaned into the broom with the same amount of force I was using. This went on for maybe 30 seconds until I realized who won here and returned to my yard work while the raven remained happily perched on the roof of my truck.

Title is kind of clickbait. One trainer was giving cheese in exchange for bread, and another was giving nothing.

The raven preferred the trainer that gave something. Not really cheating or holding a grudge.

Yeah. Given the facts of the experiment, the journalist who picked the title's calling this a "grudge" is completely outlandish.

I would like to add another corvid skill - catching bread mid air. They are as good as seagulls at this. They are also well known for bringing you shiny things in exchange for some of your lunch. I would say these beauties have been doing deals with humans for centuries and there is nothing that new in this article.

Tryied to tell me i need a viral remedy. NG your banned.

I've lived in Baltimore now for three years, and this has to be literally the only time where I (a very not-interested-in-sports person) wrongly that something DID involve football.

The National Geographic domain gave it away.