Bird netting helps protect tomato plants in the garden. Barriers, such as fencing, prevent animals from getting the goods. Chickenwire or plastic mesh fencing or lightweight bird netting (available at garden centers) can be installed around a pot or a row of plants. what animals eat tomatoes in garden, Your plant is probably being attacked by hornworms. Despite their large size, these bright green caterpillars can easily hide among tomato leaves, staying out of sight until they have eaten most of the plant’s foliage. Inspect your plants for hornworms now before they strip it down to bare stems.