Try looking for resources in individual databases.
IMPORTANT: Be sure to review the search strategies on this page for suggestions on what to type into the database!
Ancient Creatures by 
A sample broad keyword search in GVRL academic encyclopedia database:
Click on images to enlarge
A sample excerpt from an article on Ankylosaurs from Ancient Creatures in Ebsco Reference Collection:
The Holman Library One Search looks for information in ALL of our resources at once.
If you use the One Search, use filters to limit to specific source types. If you are unclear on what kind of sources to use, look back at the page "Where to Find Reliable Sources."
Keep in mind that individual databases may offer different filters.
Use the search tips on this page for suggestions on how to use keywords effectively in a database.
The image below shows a search for the broad keywords: Cretaceous AND invertebrates
NOTE: Using broad search terms can return books and other sources with info on a range of extinct vertebrates and invertebrates, while a search for only my three animals may return very little.
Use filters in One Search to limit by source type, date, subject, and more. I can limit to Reference to get started, books to learn more, and scholarship for a deep dive.
Click on a title to learn more about any source.
Click on image to enlarge
My search of the keywords cretaceous AND invertebrates returned over 9000 different sources, including newspaper articles, books, reference entries, and articles.
To learn more about a source and/or to find the Subject Terms associated with that work, click on the title of the source. That opens up the record where you can learn lots about a source without having to read it first. That's useful!
You will also find Subject Terms associated with the source. These can be a useful research tool, as a good subject term will connect you to other things that library has on that subject!
Be sure to assess all your sources of information, particularly those you find on the web.
Below is a list of some websites that may be useful for this project.
Use the range of resources included on this page to find information on your animals, eras, and people.
Type in the name of an animal, geological era, or other key idea or name you want to learn about. Search tips:
Keep your search terms simple. Use keywords rather than complex phrases.
Put phrases in quotation marks to search words in a phrase together.
Use AND to connect and focus key ideas.
Use OR to expand your search when either will work.
Use truncation (*) to search for all forms of a root word.
Try broad terms to find sources that contain information on your animal, as well as other animals.
Try narrower terms to find sources on specific topics.