All at sea

[ripcurl]

One hundred do an oral exam.
This mamal dug on good sand.
This bird sounds as if can revolve
Does this animal make the water a little warmer.
Elephants don't like them because they can't take the paper wrapping off.
A flat straw hat takes in fifty for this smoked fish.

[netkey]

last one is bloater

[kaysiecat]

This bird sounds as if it can revolve - TERN
Does this animal make the water a little warmer - OTTER

[GlenB]

Second is DUGONG

[GlenB]

Might the first be CORAL?

[sprid]

Elephants dont like PENGUINS

[ripcurl]

Many thanks everyone for your help.