I agree the black ones defiantly look like black sexlinks, but i have also had new hampshire/Australorps cross hens that look just like black sexlinks hens. The red ones color isnt right to be a rhode island red(RIR also will have back tips on their tail not white if anything) and appear to be more of some variety of red sexlink. All black ones can be difficult as their are multiple varieties of black breeds and would need more info like skin and leg color judging by the frame and stance one does seem like it could very well be a Australorp the other one on the hand to me from my experience the frame/posture/stance is all wrong to be a Australorp but then again it could just posing awkwardly.
Edit: On a side note Sexlinks make very great layers! and tend to be very healthy birds.
Edit: On a side note Sexlinks make very great layers! and tend to be very healthy birds.
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