Man is ureotelic while a bird is uricotelic.

Explanation

**Step-by-Step Solution:**

1. **Understanding Ureotelic and Uricotelic:**
- Ureotelic organisms are those that excrete urea as their primary nitrogenous waste product. This includes humans and many other mammals.
- Uricotelic organisms, on the other hand, excrete uric acid as their primary nitrogenous waste. This includes birds and some reptiles.

2. **Nitrogenous Waste in Humans:**
- Humans convert ammonia, which is highly toxic, into urea through a process called the urea cycle. Urea is less toxic and can be safely transported in the bloodstream to the kidneys, where it is excreted in urine.
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