Sentence 1: In March , they begin to feed on green plant vegetation , and these fresh greens form 90-99 % of their stomach composition from April to September .
Sentence 2: In March , they begin to feed themselves on fresh plant vegetation , and these green greens form 90-99 % of their stomach composition from April to September .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?