What do you know about dolphins?

How far should scientists stay away from dolphins when they watch them?
20 m
50 m
100 m
1 km
What do dolphins use to identify each other?
their bodies
their smell
their eyes
their whistle
How long do dolphins usually live?
5 years
10 years
25 years
40 years
How fast can dolphins swim?
40 km/h
55 km/h
65 km/h
70 km/h
When dolphins sleep, they ...
... close only one eye at a time.
... get together in groups.
... go near a beach.
... hide between rocks.
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