If you like looking at photos of mammals (and who doesn’t?!), check out the American Society of Mammalogists Image Library.
The Society has photographs of most of the mammals from 27 categories, ranging from ocean going mammals to land mammals. The categories are in Latin, but some of them look similar to their English names so you can tell what they are (eg. Cetacea and Monotremata). For the others, click on the category and look at the first photo and that should help you realize what category you’ve chosen.
Have a safe and happy long weekend!