Plastic effect our life  as well of animals very much. Answere to your question.. Plastic bags kill animal it is estimated that due this  more than 100,000 die every year.Many animals in search of food eat plastic which lead to their death.And worse thing is that ingested remain inside animal even after death of animal
Plastic is composed of hazardous materials agree?
in our house we throw garbage or leftover food vegetable peels in plastic bag animals like dogs cats cows rats etc search and eat food from these garbage which is tied in plastic animals are unaware that it is plastic and also cant remove it and eat with the garbage plastic is also eaten by them if the plastic is hazardous in nature then why cant for the animals who eat it
so first its human beings fault
hope it helps