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The Great Elephant Census Modeling Activity
Activity

In this classroom activity, students will model two types of counting methods, sample counts and total counts, to determine population size.
Expanding Cells
Image of the Week

Using a new technique called expansion microscopy, scientists are able to see more details in their specimens.
Selection for Tuskless Elephants
Scientist at Work

(6 min 39 sec) Working in Gorongosa National Park, Mozambique, Dr. Joyce Poole and colleagues make a striking observation: many female elephants lack tusks.
Understanding Variation
Activity

This lesson complements the film The Biology of Skin Color and discusses variation in human skin color and polygenic inheritance.
Zebrafish and Skin Color
Activity

This lesson complements the film The Biology of Skin Color and explores how experimental work in zebrafish led to a better understanding of the gene SLC24A5, which plays a large role in the expression of lighter skin tones.
Dead Zones in Coastal Ecosystems
Data Point

Researchers overlaid the locations of more than 400 hypoxic systems linked to eutrophication on a map of the global “human footprint.”
Exploring Trophic Cascades
Click & Learn

This interactive explores examples of what can happen when there are changes in the population size of one species in an ecosystem. How are species at other trophic levels affected? How does the ecosystem change?
Finding A Place On The Tree
Image of the Week

Dendrogramma is a newly-discovered species of deep sea siphonophore.
Human Impacts on Biodiversity
Activity

In this activity, students will use trail camera data to answer a scientific research question about the impacts of humans on species diversity in Gorongosa.
Biological Basis of a Myth
Image of the Week

Hydra is a small freshwater hydrozoan polyp that has the capacity to grow a new individual from any part of its body.
Following the Matriarch
Image of the Week

A herd of elephants moving across the floodplain grassland of Gorongosa National Park.
Zebrafish Brain Cells for Spontaneous Navigation
Image of the Week

The brain and part of the spinal cord of a one-week-old zebrafish, showing neurons that are active during a left turn (green), a right turn (red), or when swimming straight ahead (blue)
Thermoregulation in Dinosaurs
Data Point

Grady and colleagues compared dinosaur fossil evidence with evidence from living animal species to shed more light on the type of thermoregulation that dinosaurs used—ectothermy, endothermy, or mesothermy.
Discovering Keystone Species
Poster

This classroom poster illustrates Robert Paine’s pioneering experiment that demonstrated the importance of top-down regulation of ecological communities by predators and led to his coining of the term keystone species.
Film Guide for Some Animals are More Equal than Others
Film Guide

The following classroom-ready resources complement the film Some Animals Are More Equal Than Others: Trophic Cascades and Keystone Species. It tells the story of the bold experiments by Robert Paine and James Estes, which established the importance of keystone species in regulating ecological communities and the cascades of effects set in motion by their removal.
Virus Explorer
Click & Learn

Explore the similarities and differences of a variety of viruses by sorting them based on structure, genomic make-up, host range, transmission mechanism, and vaccine availability.
Virus Hunter: Monitoring Nipah Virus in Bat Populations
Scientist at Work

(9 min 1 sec) In this video we follow scientists working in Bangladesh as they test fruit bat populations to determine whether they are infected with Nipah virus—a potentially deadly virus when passed on to humans.
Undersea Fireworks
Image of the Week

The tentacles of sea anemones contain thousands of stinging cells called nematocysts that are ready to fire for defense or attack.
Alzheimer’s Disease: Piecing Together the Evidence
Click & Learn

This interactive explores evidence from brain anatomy, tissue histology, and genetic studies to reveal possible targets for the treatment of Alzheimer’s disease.
Selective Breeding in Maize
Data Point

Researchers performed the longest-running, controlled artificial selection experiment to study whether they could increase the protein concentration of maize (corn) by selective breeding.