At the age of two toddlers start to assert their independence, as they enter the childhood stage better know as the terrible twos!
By the age of two, a child starts to realise that she is the centre of her own world: She refers to "me" and "mine", and clearly asserts her desires beginning with "I want…" and "NO!". […]

…These gobies cluster in groups of up to 10 fish, each with just one male and a harem of subordinate females. The male keeps them in line by making threatening approaches, “like a bully in school,” Grober says. Males also do a courtship dance called the “jerk swim.” As long as he’s around, all is […]