Every roundup needs a sheriff, so Kevin Calhoon had to wade into the exhibit to nab the two holdouts.

The baby macaroni penguin is almost ready to go swimming for the first time, but it seems a little reluctant to play in the water. “When we take the chick into the back-up areas with the shallow pools, it is distracted and doesn’t seem to be interested in the water,” says senior aviculturist Amy Graves. Graves and the other penguin keepers have been letting this little one mingle with the other birds for short periods off and on throughout the day recently. This gives the macaroni chick a chance to get used to interacting with the other penguins and allows the other birds time to safely satisfy their curiosity. “We still have to watch the chick because the other penguins could get a bit excited and peck and squabble a bit,” Graves said. “But that’s part of life in the colony for every new penguin. Even though there’s no hierarchy, there are still some social rules that each bird has to learn. So we’re giving the chick some opportunities to learn those rules a little bit at a time.”

Gentoos Zeus and Pebbles have led keepers on an agonizing route with their chick similar to gentoos Bug and Big T. At first it appeared as though Zeus and Pebbles might turn out to be exceptional parents like macaronis Paulie and Chaos. However, within a few days of hatching, the new gentoo chick was not being fed properly by the gentoo parents. Staff members carefully monitored the situation, stepping in to feed and hydrate the chick when it was necessary. The baby was always returned to the parents after being cared for and sometimes the parents would suddenly start doing everything properly again. “It’s important to give the parents every opportunity to raise their own chick in order to help them become better parents in the future,” explained Kevin Calhoon, the Aquarium’s assistant curator of forests. “Sometimes they would return to feeding the chick normally, other times the feedings were lackluster.” As time went on, the feedings became more sporadic as Zeus and Pebbles seemed to lose some interest in the growing chick. “Once the chick cannot fit completely under the parents, the gentoos tend to not feed as much. This happened with Bug and Big T, and it happened with Zeus and Pebbles. Similar behavior has been reported to us by some of the other penguin experts we consulted with,” Calhoon said. This chick’s health was a roller-coaster. On some days Amy would report a nice weight gain, on other days, she would share her growing concern because of a setback. In spite of everyone’s best efforts, consulting with leading penguin experts and round the clock feedings, dramatic improvement was often followed by weight loss. Unfortunately we lost the battle and the chick died Friday afternoon. We don’t know at this time what ultimately led to this chick’s death, but observations from the preliminary examination will be combined with results of pending lab analysis to determine the cause of death.

One thing visitors will notice are the fluffy-looking areas next to smooth areas on this bird. The smooth areas are the sleek, swim feathers. The now somewhat ragged-looking feathers are the downy, baby feathers.

After a couple of days off, it was fun to return to work and hear the news about Zeus and Pebbles' new chick. The gentoo baby hatched on Sunday while aviculturist Loribeth Aldrich was on duty. It’s often a bit difficult to hear tiny peeping sounds over the raucous penguin calls at the Tennessee Aquarium, but Aldrich and the other penguin keepers had been keeping eyes and ears trained on Zeus and Pebbles’ nest for several days. “These two gentoos are not as keeper friendly and prefer that we keep our distance. So it has been a bit more challenging to get glimpses of this new gentoo chick,” said Aldrich. This latest addition to “Penguins’ Rock” was born right in the middle of the hatching timeframe.

There is always concern for newborn birds, perhaps more so with penguins because they face additional challenges of chilly air and must remain out of cold water. The penguin parents must be diligent in several ways. They must keep the baby warm and well-fed, safe from other curious penguins all while caring for a fragile life within a nest of angular rocks. Parents like Paulie and Chaos, the macaroni pair that produced the first chick at the Tennessee Aquarium, appeared to be naturals. We marveled at the way they shared duties incubating, and then caring for their offspring. And some people, like me, were amazed at how quickly a tiny bird became a rather large macaroni chick.

Paulie and Chaos are an example of the best-case scenario. The parents took care of their baby without staff intervention. This helps the parents develop their parental instincts, helps ensure the baby will not become too imprinted on people and allowed the chick and parents to remain with the rest of the colony.

But penguin parenting doesn’t always occur in such a textbook manner.

Senior aviculturist Amy Graves explained that even though gentoos Bug and Big T had been attentive in some ways to their chick, they had not been feeding the baby on a regular basis. So Aquarium staffers have had to supplement the feeding schedule with “penguin milkshakes” served in a variety of ways. “We created a formula that is a mixture of krill, capelin and different vitamins that are all blended together to a nice consistency,” Graves said. “At first, we fed this formula to the chick without anything else. But as it got a bit larger, we would then dip a small fish, either a silverside or capelin, into the milkshake and feed that to the chick.” Keepers had to step in and supplement Bug & Big T’s feedings up to three times daily. Sometimes the parents would feed the chick, but mostly it was Aquarium staff working to keep the tiny bird’s weight up.

Throughout the past few weeks, Graves and other Aquarium staff members have been consulting outside penguin experts who have been following the macaroni chick’s progress and this gentoo chick’s struggles.

When I answered the phone this morning, I could hear the sadness in Amy Grave’s voice immediately. She had called to inform me about the loss of Bug & Big T’s chick. It’s difficult news to hear, especially when you know how dedicated the penguin keepers and volunteers are when it comes to providing the highest level of care to these captivating animals.

Kevin Calhoon, the Aquarium’s assistant curator of forests, said that this might not be just a case of poor parental instincts. Ironically, their lackluster feedings could indicate that Bug & Big T picked up on signals about this chick’s health that we are unaware of. “Many bird species will simply stop feeding their young if everything isn’t ‘just right’ with the baby,” Calhoon explained.

Zeus and Pebble’s were seen feeding the newest gentoo chick this morning and Graves says they are very protective of their baby. If Zeus and Pebble’s turn out to be as diligent as Paulie and Chaos, we should see this gentoo chick grow quickly in the coming days.

The sadness of today’s news is tempered by the joy of watching guests inside “Penguins’ Rock.”

Today, Aquarium visitors will be amazed by the baby macaroni born on June 18th . That chick is now seen occasionally gobbling down fish from a feed pan without assistance from Chaos and Paulie. Guests are also noticing some other changes in this bird’s appearance. “If you take a good close look at its chest and flippers, it looks like it’s had a haircut,” said Graves. “That’s caused by the swimming feathers coming in and pushing out the soft, little downy feathers.” The baby macaroni is also growing stubby, bristly tail feathers. And Graves says this bird may have all of its handsome black and white plumage in the next two weeks. “Once that happens, the baby macaroni will be ready to start swimming with the colony, hopefully by the end of the month,” Graves said.

Gentoo baby at one day.

The Tennessee Aquarium has another new addition to "Penguins' Rock." A baby gentoo was born yesterday and so far parents Bug and Big T have been doing a pretty good job with their chick. There has been some concern because these new parents were pretty rough while they were turning and incubating their eggs. In fact, one of the eggs was crushed in the nest and the remaining egg had a small chip out of it. Senior aviculturist Amy Graves showed me the second eggshell and it's amazing that the chip didn't go through to the interior of the shell. But penguin eggs are much thicker than chicken eggs, and therefore durable enough to take some scrapes and bumps in a nest built out of stone. However, one misstep by the parents now could cause injury to this tiny newborn.

One month ago, we watched Paulie and Chaos caring for their tiny baby. There are some differences between the two in the "Day one" photos above. For example, the mac chick is darker and doesn't resemble the parents at this early stage. However, the lighter colored gentoo chick already sports an orange beak and white circle around the eyes like its parents. But the baby doesn't have the signature gentoo white head stripe yet.

The baby macaroni penguin started off with light gray feet, but now they are turning pink like the adult macaronis. Notice that it still lacks the signature "macaroni" crest feathers in this more recent image.

By the way, the weather is supposed to be spectacular this weekend. Have you seen the forecast? http://forecast.weather.gov/MapClick.php?site=hun&map.x=316&map.y=93

Perfect for a visit to Chattanooga, the Tennessee Aquarium and a cruise aboard the River Gorge Explorer. www.tnaqua.org

Check out the details here: http://www.tnaqua.org/planYourVisit_rge.aspx