Translation of "Oursin" in English

Comment distinguer celles d'un poulpe, celles d'un oursin,

What's the difference between octopus tracks and heart urchin tracks

- Marie est un animal marin.
- Marie est un oursin.

Mary is a sea urchin.

Une fois, Christophe Colomb mangea accidentellement un oursin. Ensuite il le refit, intentionnellement.

Christopher Columbus once accidentally ate a sea urchin. Then, he did it a second time... intentionally.

Mais c'était en journée, en faisant son travail que le biologiste, Richard Fitzpatrick, est devenu la proie d'un oursin en colère.

But it was during daylight hours doing his job that marine biologist Richard Fitzpatrick fell prey to one angry urchin.