Biology Unit 3 - Topic 10 - Reproduction vs. Extinction.

 

Reproduction in Animals

To prevent animals from extinction, reproduction needs to progress at a faster rate than destruction.

All living creatures reproduce. It is what makes living different from non-living. When an organism reproduces, it ensures that the species will continue. Without the continuation of the species, they would become extinct.

Reproduction vs. Extinction

A species that cannot reproduce enough offspring will eventually disappear forever from the face of the Earth – it will become extinct. This has happened many times throughout history.

Can you think of the best-known examples of animals that have become extinct?

Exactly!

Extinct Animals

1. Mammals:
• Dodo (Raphus cucullatus)
• Woolly Mammoth (Mammuthus primigenius)
• Tasmanian Tiger (Thylacinus cynocephalus)
• Caribbean Monk Seal (Neomonachus tropicalis)
2. Birds:
• Passenger Pigeon (Ectopistes migratorius)
• Great Auk (Pinguinus impennis)
3. Reptiles:
• Pinta Island Tortoise (Chelonoidis abingdonii)
4. Amphibians:
• Golden Toad (Incilius periglenes)
5. Marine Life:
• Steller's Sea Cow (Hydrodamalis gigas)

Extinct Insects

• Xerces Blue Butterfly (Glaucopsyche xerces)
• St. Helena Giant Earwig (Labidura herculeana)

Why Do Animals Become Extinct?

There are many factors that contribute to a species becoming extinct. Species closest to extinction are classified as endangered.

Here are some common causes of animal extinction:

• Habitat destruction: Deforestation and urbanization destroy natural habitats.
• Pollution: Chemicals and waste harm ecosystems and species survival.
• Overexploitation: Overhunting, fishing, and poaching lead to population decline.
• Zoos: While zoos can help with conservation efforts, poorly managed ones harm animals.
• Climate change: Rising temperatures and changing ecosystems impact species.
• Global warming: It affects reproduction rates and food sources.

Did You Know?

• 99% of all species that ever lived on Earth are now extinct. This includes animals, insects, and plants.
• The Dodo became extinct in less than 100 years due to hunting and habitat loss.
• Insects like the Xerces Blue Butterfly are often first affected by human activities, as their small habitats are destroyed rapidly.
• Animals with low reproduction rates, like the Panda or the Blue Whale, are at a higher risk of extinction.

The Importance of Reproduction

Reproduction ensures the survival of species. Without it, the natural balance of ecosystems would collapse, leading to further extinctions. Protecting animals and their habitats is essential for maintaining biodiversity on Earth.

What can we do?

• Support wildlife conservation projects.
• Protect natural habitats.
• Educate others about endangered species and the importance of reproduction.

What other extinct animals or insects can you think of?

Share them in the comments!

Let’s work together to spread awareness and help protect our planet’s wildlife.