He started to get up, then looked back to his mate again, and settled down and dozed.

A shrill and minute singing stole upon his heating.

Once, and twice, he sleepily brushed his nose with his paw.
Then he woke up.

There, buzzing in the air at the tip of his nose, was a lone mosquito.

It was a full-grown mosquito, one that had lain frozen in a dry log all winter and that had now been thawed out by the sun.