Here are a few examples of their intelligence:

1. Tool Use: Crows have been observed using tools to obtain food and solve problems. For example, they may use sticks to extract insects from crevices or bend wires to reach food that is otherwise inaccessible.

2. Problem-Solving: Crows are able to solve complex problems, such as figuring out how to open a puzzle box or how to escape from a trap. They can also learn from their mistakes and adjust their behavior accordingly.

3. Cacheing: Crows often cache or store food for later consumption. They have excellent spatial memory and can remember the location of their caches even after a long period of time.

4. Communication: Crows have complex vocalizations and body language that they use to communicate with each other. They can convey information about food sources, danger, and other important social cues.

5. Social Behavior: Crows live in social groups and exhibit cooperative behaviors. They may share food, defend their territory, and even engage in reciprocal altruism, where they perform acts of kindness with the expectation of future reciprocation.

6. Adaptability: Crows are highly adaptable and have been able to thrive in a wide range of habitats. They have learned to coexist with humans and often take advantage of human-made resources.

Overall, crows have demonstrated remarkable intelligence in various cognitive domains, making them one of the most intelligent bird species in the world.