In some cases, adult marmots such as alpine marmots (Marmota marmota), yellow-bellied marmots (Marmota flaviventris) and woodchucks (Marmota monax) have been preyed upon when lighter and weaker in spring, collectively weighing on average about 3500 grams or about three times as much as a female goshawk although are basically half of what these marmots can weigh by fall.