Well, when you say "animal" that's a very broad term. In Binomial Nomenclature, Animalia refers to bugs (or arthropods if you want to be scientific), birds, fish, mammals, etc. Because of this, there are many animals that are smaller than your thumbnail. Therefor, there are many species which are smaller than your fingernail, including many bugs, plankton, etc.
A thumbnail is a smaller or scaled-down version of an image. When you search Google images, for example, you will see thumbnail version of the image, rather than trying to load the full image on the page.
Dog as puppies are born only Pink and Bald but they should never be as small as a thumbnail that would proably not be healthy and if it is you have to have it check at a vet.
A small version of a large graphic on a web page is often called a thumbnail. Many designers use them to put more on a single page and make it easier to browse.
on of thumbnail in MS word
Thumbnail crab was created in 1793.
Thumbnail
It may be, depending on the software being used to view the thumbnail. A thumbnail in and of itself is not clickable, as it is merely a collection of bytes that form an image on the screen. However, the picture of the thumbnail may be clickable depending on the software used to view the thumbnail.
Animal Cells Are Smaller than Plant Cells
thumbnail
A smaller penguin.
why are the number of plant systems smaller than animal systems.