Those creatures never proved anything other than mythological.

More often than not, the creatures prove themselves capable of considerable silliness, and the children who look after them have to step in to set matters right.

A creature of the night, The Shadow was proving his power to pass unseen.

He was glad that the creature hadn't proved telepathic, for a nontelepathic world would make his own detection far less likely.

Whether Empath were dead or alive, these creatures proved their honesty, for they were torturing the boat's staff.

It could be wise to make a quick examination; if the creature should prove suitable as a host.

I thought this creature would prove not to be from 'Out There.'

Felix knew that evil sorcery was at work here, when creatures so weak and sickly could prove so hard to kill.

This creature proved to be a sitting duck for advertisers.

It seemed a slim hope, but now the creatures proved valuable in another, unexpected way.