Pass the Mealworms, Please!
Posted at 3:25 pm October 27, 2009 by CelenaZoo InternQuest is a career exploration program for high school students. For more information see the Zoo InternQuest Journals. For more photos see the Zoo InternQuest Photo Journal.
Are you up to a trip to your grocery store? Many people would agree that going to the grocery store is a burden, even a bore. However this is hardly true when the food selection goes from wriggly to bizarre, including mealworms, mice, rabbits, crickets and baby kangaroo formula in powder form. Guided by Dr. Mike Schlegel, the director of nutritional services at the San Diego Zoo, and Dr. Jennifer Parsons, associate animal nutritionist, we visited the forage warehouse, where all of the “raw materials” for the animal diets are stored. The forage warehouse includes these Fear Factor-qualifying foods—including stiff mealworms and cold rodents.

Stepping inside of the spacious refrigerators rapidly sent consecutive waves of goose bumps down my back; the chilling effect was quickly overridden by my amazement in the large crates and boxes of fruits and vegetables, and the numerous trays of mealworms. The large refrigerator and pantry rooms resemble a market, filled with delicious goods available for the animals to chow down on. Each animal species at the Zoo requires its own unique diet—not only in the specification of certain foods, but also in how the food is prepared and served. Although some of the foods eaten by the over 800 species at the Zoo and Wild Animal Park would not suit our palate, many others would be deemed acceptable.
From Tabasco sauce to papayas to Crystal Light, animals share an array of foods with us, as displayed in the forage warehouse. Unfortunately, animals not only share foods with us, but also diseases and health issues connected to food consumption. Joint disease, obesity, diabetes, respiratory disease, and low weight are a few of the problems Dr. Schlegel and Dr. Parsons are faced with. They analyze the source of the issue and tackle it by offering an altered diet, preparing the food or serving the food differently to ensure that the animals “eat their vegetables” or whatever it is that’s good for them.
For example, the blue-eared lories at the Zoo were having difficulty meeting their energy requirements from their diet. It turned out that the liquid glucose they were fed was hard for them to eat; after the dry nectar was switched with the liquid, the lories’ health greatly improved. Of course, some food-linked health problems are harder identify and find an easy fix for. Sometimes, these issues are not directly related to the food the animals are served. For example, Dr. Schlegel explained that some of the Zoo’s reptiles were insufficient in vitamin D, needed to absorb calcium. The source of the problem was surprisingly, the lack of sunlight in the reptiles’ habitats. Reptiles often lounge on large rocks, absorbing the sunlight. It was decided that special lighting in some enclosures would be installed to provide UVB and in others, special UV transparent glass was installed so the UV from the sun could get in to the reptiles, fulfilling their vitamin D requirements.
Much can be learned from this scientific approach for solving weight issues. Humans have a tendency to try to solve weight issues in a round-about and ineffective way: cutting carbs, skipping meals, following fad diets to shed pounds, or binge eating and eating fatty foods to gain weight. Dr. Schlegel made the concept of eating simple – energy in and energy out. No fad diets, just good science.
In Dr. Schlegel’s workday, he may find a simple fix for nutrition dilemmas, such as in the lories’ case. Or, in the case of the reptiles, the cure may be found with extra analytical thinking and problem solving, which dietitians can provide. By pinpointing the causes of our diet problems we too could be on our way to a healthier lifestyle.











But math isn’t the only thing that goes into doing his job. Dr. Schlegel also needs to keep up on his physics and chemistry. While this may seem a bit unexpected, in actuality it is a very important part of his job. You see, food isn’t the only way animals receive the nutrition they need. Take Komodo dragons, for instance. If Komodo dragons don’t get enough vitamin D, they run the risk of developing metabolic bone disease, which weakens their bones. However, Dr. Schlegel can’t simply feed these reptiles vitamin D, as then it will not be transferred into their bloodstream. So if Komodo dragons don’t digest this vitamin, then how do they get it? The answer lies in sunlight. The UVB rays from the sun triggers a reaction that causes the release of vitamin D into the animal’s bloodstream. This is where the chemistry comes in. The physics occurs when Dr. Schlegel measures how intense the UVB rays are that are hitting the Komodo dragons, and if enough of the rays are coming through the glass of the enclosure.
We met a few of the animals that live here in our region with Jean-Pierre Montagne, a senior research technician in the Applied Animal Ecology division at the San Diego Zoo’s Institute for Conservation Research. Mr. Montagne holds a bachelor’s degree from UCSD in Ecology, Behavior, and Evolution, and has plenty of experience behind him.
A recent trip to the Wild Animal Park brought us to a very different part of the Park than I had been before. The Park sits on 1,800 acres, but only 900 of those acres have been developed for the actual park portion. The other half is set aside for conservation. It’s a preserve for local Southern California wildlife and is part of the Multiple Species Conservation Program. The Multiple Species Conservation Program is part of local legislation that is committed to preserving San Diego County’s habitats and wildlife. The Wild Animal Park is obliged to protect, monitor, and maintain their 900 acres of natural preserve. The natural preserve provides a home for local animal species and is an important part of a system of protected habitats that allow for animals to move from habitat to habitat in a set of connected corridors. This land is only allowed for some off-site breeding and minimum public viewing. The Park’s mule ride is one way you can view this scenic and special piece of habitat.







