Why do people expect wild animals to understand English?

It's the calming tone of voice rather than the words that the animal understands.  

I don't know. Most Brits can't even understand it and they claim they invented it. 

If you kep on and on they eventually 

For the same reason that when people go into a Chinese grocery and assume the people don't speak or understand English they talk louder and more inunciated......

Because people don't speak wild animal.

I would like to know why do people expect their questions to be answered when they cannot take the time and trouble to think about something first.

The human language spoken by the vet does not matter. It is the tone of his voice that the bear can hear. The vet was I can guarantee was speaking in a low and calming voice.

He's just trying to project calm.