x= c(0,1,0,0,0,1,1,0) # 0= delfin;1 =leonmarinoarino
y= c(0,0,0,1,1,1,1,0) #0= macho; 1=hembra
z=table(x,y)
rownames(z)= c("delfin","leonmarino")
colnames(z)=c("macho","hembra")
z