By Rebecca Perring PUBLISHED: 06:01, Sat, … A black edged bluish stripe runs along the middle of the larva's back for the length of its body. Fully grown larvae can appear similar to caterpillars and are yellow-green with black spots along their sides. As big as they are, they are really hard to see among the foliage when they're resting. This is another big caterpillar -- about the size and thickness of your thumb. The caterpillar is the growing stage in the insect’s life and it will moult several times to enable its body to expand.The stage between each moult is called an instar and most species undergo this process four to six times. These caterpillars are prey to just about every predatory insect, bird, reptile, amphibian, and animal out there so I wouldn't worry too awfully much about what you need to do. The solitary larvae feed on Silver Birch leaves between June and September and can grow up to 45mm in length. ... as they ate their way through the silver birch leaf. They use it to scare predators away, so be careful. CATERPILLARS are plaguing gardens across the UK and destroying one of Britain’s most common plants - the box tree - in just a matter of days. Larvae of the dusky birch sawfly feed on birch tree leaves. The galleries of Butterfly caterpillars, Moth caterpillars and Sawfly caterpillars contain images of many of the caterpillars most likely to be seen in the British Isles. It's closely related to the cecropia moth (above). Galleries for many other parts of the world are being added including North America, The United States and Canada , Africa and Asia. A caterpillar frequently found in gardens and the countryside is the caterpillar of a sawfly often referred to as the The Honeysuckle Sawfly. Many exotic species of birch are planted in urban settings throughout the UK, including the Himalayan Paper Birch , … The silver birch, also known as the white birch, grows from 40 to 50 feet in height with a slender trunk that seldom exceeds a foot in diameter. This page lists the larval foodplants used by British and Irish butterflies. The Maryland Cooperation Extension refers to the larvae as "gregarious" and notes that the insects-to-be generally feed in groups, with the edges of leaves being devoured first. One of several similar species is Zaraea fasciata. Always found in hoards, unfortunately, which can be kind of disconcerting. Caterpillars have been spotted 'dancing' to put off predators as they eat their way through a leaf. Caterpillar Facts • Although the Very Hungry Caterpillar was a very greedy caterpillar, most are actually quite picky eaters and stick to one or two types of leaf. 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