What's on the site
- Species: Colorado's listed and at-risk animals in one list you can filter by group, federal and state status, and habitat. Each group has its own page: mammals, birds, fish, reptiles, amphibians and invertebrates.
- Habitats: Colorado's life zones from shortgrass prairie to alpine tundra, with an interactive mountain that shows where species live.
- Questions: every question the site answers, searchable and grouped by animal group.
- Threats: how disease, water diversion, habitat loss and other pressures affect Colorado's wildlife.
- Wolf Tracker: the count, packs and removals of Colorado's reintroduced wolves.
- News: species listings, reintroduction, field reports and seasonal guides.
- Lost & Extinct: the animals Colorado has lost since the 1800s, and why.
Classroom activities
Each activity uses only features of the site, so students can work from the pages themselves.
- Climb the mountain. Open the Habitats explorer, choose a zone, then select three species photo pins. For each, note the zone and elevation range it shows, then open its full profile to see what else it says about where it lives.
- Follow a threat. Pick an animal from the species list and read its status badges. Use the Threats chips on its profile to open a threat page, read its "At a glance" box, then find the other species it lists under "Species on this site."
- Answer with a source. Search the Questions hub for a question you are curious about. Read the short answer, then open the Sources list at the bottom of the article and name the publisher behind it.
- Compare a lost and a listed species. Choose one animal from Lost & Extinct and one from the species list. Compare the cause of the loss with the threats on the listed species' profile.
- From headline to profile. Read a post from News, then use its "Species in this story" cards to open the profile of an animal it mentions. Find the date the profile was last reviewed.
How to cite this site
Cite the page you used, not just the site. You need the page title, the date accessed and the page's address. For the date, use the "Last reviewed" date shown under the title of a species profile; if a page shows none, leave the date out. The text below is the pattern; the examples cite a real profile. Click an example to select it, then copy.
Pattern
Threatened Colorado. "Page Title." Threatened Colorado, Last Reviewed Date, URL. Accessed Date.
MLA
Threatened Colorado. "Black-footed Ferret." Threatened Colorado, 5 Oct. 2026, threatenedcolorado.org/species/black-footed-ferret/. Accessed 11 Oct. 2026.
APA
Threatened Colorado. (2026, October 5). Black-footed ferret. https://threatenedcolorado.org/species/black-footed-ferret/
Replace the accessed date with the day you read the page. Profiles are rechecked, so a page's last-reviewed date may be newer than the one in the example.
Sources and accuracy
Each species profile lists its sources in a collapsed Sources section at the bottom of the page, and shows the date it was last reviewed. How we source on the About page explains which agencies we trust first and how we keep pages current.
Using it in Google Classroom or your LMS
Every page has its own address, so you can paste a link straight into an assignment. There is no login or account, and the site carries no ads and no sponsored content. It is free to use. The site does use Google Analytics to see which pages people read; see the privacy page.
Spot a mistake?
Email threatenedcolorado@gmail.com with the page and what looks wrong. A link to a source helps.