Ten rare Humboldt penguin chicks have hatched at Chester Zoo, with a "devoted duo" stepping in to help with parenting duties.

The rare new arrivals are highly threatened Humboldt penguins, one of the most at risk out of the world's 17 species of penguin.

The chicks have spent their first few weeks of life tucked away in their nest burrows.

With penguins, both mum and dad share feeding and parenting duties. Keepers support the parents by providing plenty of extra fish, which the adult penguins swallow, blend into a protein-rich soup and then regurgitate to feed the chicks.

The chicks have spent their first few weeks of life tucked away in their nest burrows (Image via: Chester Zoo)

In a heart-warming development, one of the chicks is being raised by a same-sex penguin couple, Scampi and Flounder.

The devoted duo stepped in to help raise one of two eggs laid by another penguin pair, Wotsit and Peach.

The zoo's bird experts carefully shared the eggs between the two nests to help give both chicks the best possible start and help improve chances of successful fledging.

Now, keepers say the chicks are just 'days away' from taking the plunge into their very first swimming lessons at the zoo's Penguin Island habitat - a special milestone where they'll be seen taking to the water alongside their parents.

As part of a long-standing zoo tradition, conservationists pick a different naming theme for the chicks each year. Previous topics have included chocolate bars, brands of crisps and even NHS heroes during the Covid-19 pandemic.

This year's cohort have been named after stars and celestial wonders, with keepers dubbing eight of the chicks Ursa, Alcyone, Quasar, Orion, Dorado, Cassiopeia, Altair and Xena.

This year's cohort have been named after stars and celestial wonders (Image via: Chester Zoo)

The final two chicks are yet to be named, with the public being asked to help choose their names via a special vote across the zoo's social media channels.

Zoe Sweetman, team manager of penguins at Chester Zoo, said: "The fluffy new arrivals are all being looked after brilliantly by their parents, having nearly quadrupled in size since they first emerged.

"They're now days away from a really exciting milestone - their very first swimming lessons, which is always a thrill to witness as they dive into the pool for the very first time.

"In what has been one of our long standing traditions, each year we pick a fun theme to help name our chicks, which helps us keep track of who is who now that there are 63 penguins in the colony.

"This year we've gone with a celestial theme for naming the chicks and we've had a lot of fun coming up with names inspired by stars, constellations and cosmic wonders.

"But we've saved the final two names for the public, who can help us choose via the zoo's social media channels."

Humboldt penguins are listed as vulnerable to extinction by the International Union for the Conservation of Nature (IUCN). Found on the rocky coastal shores of Peru and Chile, they face a number of threats in the wild, including climate change, overfishing and rising ocean temperatures.

These factors are reducing the availability of fish and forcing the penguins to travel further from their nests to find food, which increases the risk of survival to both adults and their chicks.

The penguin colony at Chester Zoo plays a vital role in the international breeding programme for the species, helping to maintain a genetically healthy population in conservation zoos across Europe.