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Animal behaviour
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Charles Darwin Ivan Pavlov honeybee Interactive thumbnail shows an animated map of monarch butterfly seasonal migration. stickleback American crow against a natural green background.
A brown cow in a grassy field scratches its face with a long-handled brush, with trees and a house in the background.
Diagram illustrating sex-linked inheritance of white and red eye color in Drosophila fruit flies, showing genetic crosses between white-eyed and red-eyed males and females, with chromosomes and resulting eye color traits mapped through two generations.
Observe an anole change its skin colour for camouflage and fan its dewlap to mark possession or attract a mate
Diagram illustrating three types of natural selection-stabilizing, directional, and diversifying-showing how each affects the distribution of beetle phenotypes in a population over multiple generations. Shaded areas indicate phenotypes selected against, and arrows show shifts in population traits.
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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Animal behaviour: Media

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Videos

Veronika the Cow Demonstrates Tool Use
Austrian cow Veronika proved in 2026 that cows, like crows and chimps, have the ability...
Video: Antonio J. Osuna-Mascaró and Alice M.I. Auersperg. Flexible use of a multi-purpose tool by a cow. Current Biology, 2025.
Observe an anole change its skin colour for camouflage and fan its dewlap to mark possession or attract a mate
Most anoles can change colour. The brightly coloured throat fan, or dewlap, signals...
Video: Encyclopædia Britannica, Inc.
Learn about bats' roosting, flying, and dietary habits and their echolocation sense
Bats rely on a unique form of sensory reception, called echolocation, to locate objects...
Video: Encyclopædia Britannica, Inc.
Survival struggles in a meerkat colony
A dominant female meerkat expelling a subordinate from the pack.
Video: Contunico © ZDF Studios GmbH, Mainz

Images

Charles Darwin
Charles Darwin, carbon-print photograph by Julia Margaret Cameron, 1868.
Julia Margaret Cameron/Library of Congress, Washington, D.C. (LC-DIG-ds-16381)
Ivan Pavlov
National Library of Medicine Digital Collections, National Institutes of Health (101426180)
honeybee
Honeybee (Apis mellifera)
Ingmar Holmasen
stickleback
Three-spined stickleback (Gasterosteus aculeatus).
© slowmotiongli—iStock/Getty Images
American crow (Corvus brachyrhynchos)
The typical call of the American crow (Corvus brachyrhynchos) is a loud...
© Steve Byland/stock.adobe.com
sex-linked inheritance
Sex-linked inheritance of white eyes in Drosophila flies.
Encyclopædia Britannica, Inc.
Types of natural selection
Three types of natural selection, showing the effects of each on the distribution...
Encyclopædia Britannica, Inc.
European, or common, starling
European, or common, starling (Sturnus vulgaris).
© Brian Kushner/Dreamstime.com
Sparrow
House sparrow (Passer domesticus)
Eric Hosking

Interactives

Monarch butterfly migration
Migratory monarch butterflies migrate south each fall, sometimes traveling as far...
Encyclopædia Britannica, Inc.
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