It seems like there may be a misunderstanding in the question, as “50 – 100 jr in blauw is roofdier (?)” does not make sense in English. However, I will try to interpret the question and write an article based on the information given.
If we were to assume that “50 – 100 jr in blauw is roofdier (?)” means “50 – 100 years in blue is a predator (?),” we could explore the concept of time and predators in nature.
The passage could be interpreted as referring to the lifespan of a predator in the wild, which can vary greatly depending on the species. Some predators, such as lions and tigers, can live up to 20 years in the wild, while others, like wolves and bears, may live closer to 10 years.
The color blue could be symbolic of the environment in which the predator lives, perhaps a reference to bodies of water or the sky. Predators that live near water, such as sharks or crocodiles, may have a blue hue to their surroundings.
Overall, the passage could be seen as a poetic reflection on the nature of predators and the passage of time in the natural world. It reminds us of the beauty and complexity of the animal kingdom and the delicate balance that exists between predators and prey.