Though their eyes may not function or appear the same as most other eyes in the animal kingdom, the sea scallop may be the animal with the most eyes. The scallop has hundreds of tiny eyes attached to its mantle, which appears at the outer edge of each of this bivalve's two shells.
As of May 2014, the rarest animals on earth included the Javan rhino, which at that time had fewer than 40 specimens worldwide, and New Zealand's black stilt bird, which had a population of just 27. Overall, the rarest animals on earth tend to also be the most endangered, and this may be a difficult and ever-changing category to identify.
The exact amount of time that a diving bird can spend underwater will vary by species, but typically, these birds can spend between 3 and 10 minutes under the surface of the water. In addition to being able to hold their breath, these birds may have adapted specific helpful physical features to help them stay underwater.