By familiar clicks of the tongue and other special calls. Like how you're mother calls "HENRY!" or amother name.....
The cuckoo is the bird which never builds nest. Cuckoos lay their eggs in the nests of other birds and leave the "adopted parents" to raise the cuckoos own chicks.
Penguin chicks and penguin eggs are preyed upon by other breeding animals. Antarctic skua, for example, with their hooked beaks and talons at the ends of their webbed feet, do take penguin chicks and penguin eggs to feed their young. Adult penguins are not preyed upon by other animals on land, unless they are injured.
Usually by recognition. Like most babies - penguin chicks 'imprint' on their parent from the moment they arrive. Additionally, the parent bird can recognise their chicks calls from some distance away.
Curious question ('Meanest to who or what, and in what respect??') Highly unlikely to come across a 'mean, nasty Penguin' as such, though, only one species actually nurtures their adolescent chicks!! (The Gentoo) All other species, just about disregard their offspring when they are no longer 'Chicks' apart from, the Gentoo, which does continue to nurture 'Teenagers' as it were? Does that make the other 16 species 'Mean' as such? I doubt that's a term that correctly applies!!
Breeding takes place from late October to February. Couples build circular stone nests on icebergs, within large colonies that include other chinstraps, but also Adélie and gentoo penguins. Parents take turns sitting on the eggs---they switch places every five to 10 days. In a little over a month, the eggs hatch. The chicks grow quickly, and are covered by a soft, gray down. They huddle against their parents for warmth and protection. Unlike some other penguin species in which the strongest chick is favoured, chinstrap parents treat both chicks equally. When they are 20 to 30 days old, the young form groups with other penguins their own age. By the time they reach two months, their waterproof feathers have grown in and the chicks are old enough to be self-sufficient.
Other collective nouns for 'chicks' are:a chattering of chicksa clutch of chicksa peep of chicks
Other collective nouns for 'chicks' are:a brood of chicksa chattering of chicksa peep of chicks
by a heat source: lamp, light, or other chicks.
because it lives in a colony they can warn each other and it has the advantage of going in land and going it in the water
There is really only one predator for the adult Emperor Penguin, and that is the Orca. The Leopard Seal, does take some adults, but prefers fledglings, when they first try swimming out in the water. The other dangers for this species is for the chicks. The Southern Giant Petrel kills chicks, often many in a single colony.
Chicks don't need nor do they often have "parents" in that sense of the word. The rooster does not have anything to do with them unless they are members of his current flock, and then the only thing he does is protect the flock as a general duty. The mother hen simply provides some warmth and protection for the first few weeks. She has no other duties as they do not feed or "teach" chicks how to eat or drink. Many chicks are artificially incubated and do not have "parents" They simply need shelter, food and water to survive.
Yes, it is necessary to separate parent lovebirds from other birds, especially during breeding and raising their chicks. This helps to prevent stress and potential aggression from other birds that may invade their space or disturb the nest. Additionally, separating them allows the parents to focus on caring for their offspring without distractions or threats from other birds. Once the chicks are weaned, the parents can be reintroduced to the flock if desired.