![_Forrest Jennings_Amphibians_ Reptiles_ and Fish_Calling for You with all my Heart](https://wildlife.org/wp-content/uploads/2023/04/Forrest-Jennings_Amphibians_-Reptiles_-and-Fish_Calling-for-You-with-all-my-Heart.jpg)
©Forrest Jennings
Measuring forage quantity and quality for herbivores
Summer 2025, Location TBD
Introduction to stable isotopes in nutritional ecology held at TWS 30th Annual Conference – Louisville, Kentucky
![Isotope](https://wildlife.org/wp-content/uploads/2023/07/Isotope.png)
Become a member
Membership is available to all current TWS members. You may join our Working Group by logging in to your TWS account.