Attacks toward the pair partner in Black-tailed gull III

Attacking toward the pair partner in Black-tailed gull I

Attacking toward the pair partner in Black-tailed gull II

Duet of long calls in black-tailed gull

Threatening behavior of a black-tailed gull toward a grey heron

Predatory sculpin attacks toward ink clouds released by the Japanese pygmy squid

Long-call of black-tailed gull

Greeting ceremony of black-tailed gull

Pecking of black-tailed gull: Dummy experiment ４

Pecking of black-tailed gull: Dummy experiment 1

Pecking of black-tailed gull: Dummy experiment ３

Pecking of black-tailed gull: Dummy experiment 2

A black-tailed gull, eating a dead crucian carp

A black-tailed gull eating a baby red-eared slider

Toward the Unknown

Blueprint Toward the Universe

Courtship feeding in a couple of black-tailed gulls

Long calls of a pair after attacking against a intruder

Officers in the Nigerian army commanding an attack on the Biafran army after storming the town of Uli

The Assault of the Shoe

3.A new street looking toward the Imperial Palace, in Tokyo

Supplementary material 1 (Video). The aggressive behavior of marked worker toward an attached worker

Mouth-wrestling in male butterflyfish

Pair of Lovers in the Forest

Woman in Black (Before the Theater)