The Animal Kingdom

A survey of animal diversity from invertebrates to mammals — anatomy, behavior, and the remarkable adaptations of animals.

Beginner 15 guides
1

Introduction to Animal Diversity

From sponges to mammals — an overview of animal phyla

2 min read 392 words
2

Invertebrates — The Other 97 Percent

The vast majority of animal species without backbones

2 min read 400 words
3

Insects and Arthropods

The most diverse group of animals on Earth

2 min read 382 words
4

Fish and Aquatic Vertebrates

From jawless fish to sharks and ray-finned fish

2 min read 388 words
5

Amphibians — Life Between Water and Land

Frogs salamanders and the transition to terrestrial life

3 min read 406 words
6

Reptiles and Their Diversity

Snakes lizards turtles and crocodilians

2 min read 382 words
7

Birds of the World

Avian diversity flight adaptations and migration

2 min read 384 words
8

Mammals — Characteristics and Diversity

Hair milk and warm blood — what makes mammals unique

2 min read 398 words
9

Primates and Animal Intelligence

Tool use problem solving and cognition in animals

2 min read 388 words
10

Marine Invertebrates

Coral jellyfish octopus and other ocean dwellers

2 min read 374 words
11

Animal Locomotion

Swimming flying running and unusual forms of movement

2 min read 376 words
12

Animal Senses — Beyond Human Perception

Echolocation electroreception and ultraviolet vision

2 min read 394 words
13

Venomous and Poisonous Animals

Chemical weapons in the animal kingdom

2 min read 384 words
14

Animal Camouflage and Mimicry

How animals hide and deceive predators

2 min read 384 words
15

Endangered Animals — Species on the Brink

The most threatened species and their survival challenges

3 min read 406 words