Articles on Mammals

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A beaver at Miquelon Lake Provincial Park near Edmonton. Once a pond is completely covered in ice, beavers are confined below the surface for the winter. (Glynis Hood)

Beavers are emerging sooner in spring amid warmer weather

As our climate warms, beavers are appearing sooner and moving northward. This could have implications for the environment and human infrastructure.
Golem Grad island in North Macedonia is full of Hermann’s tortoises. However, demographic projections suggest the last female could be wiped out by 2083. A female (pictured) that had fallen down a sheer drop of more than 20 metres.

Self‑destructive behaviour among Hermann’s tortoises on a Macedonian island is leading to ‘demographic suicide’

Female tortoises are bearing the brunt of the brutal behaviour of their male counterparts, who are regularly pushing them off cliffs in North Macedonia.
Yellow crazy ants (Anoplolepis gracilipes), or Maldive ants, are among the world’s 100 most invasive species. Roman Prokhorov/iNaturalist

Biological invasions can cause severe animal suffering

Biological invasions can severely harm the welfare of animals, causing them to suffer. AWICIS is a new framework that can be used to assess the severity of these impacts.
Gray whales have unique markings, making it possible to track each one in the bay. Jane Tyska/Digital First Media/East Bay Times via Getty Images

Gray whales are dying in San Francisco Bay at an alarming rate – this isn’t normal

In the past, the gray whale population recovered fairly quickly. But data on baby whales show that isn’t happening, and a new study finds an alarmingly high mortality rate.
Part of an illustration by an unknown artist from around 1250 showing a hedgehog stealing fruit. Getty Open Content.

Why hedgehogs used to be hated

In the past British people believed hedgehogs could cause harm and damage livestock, and even that witches could transform into them.
A child may temporarily have baby teeth, adult teeth and gaps all at once. BSIP/Universal Images Group via Getty Images

Why do people have baby teeth and adult teeth?

A pediatric dentist and an anthropologist explain how baby teeth and adult teeth help humans chomp their food over a long lifespan.

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