Monotremata memiliki banyak kemiripan dengan sesama Hewan mamalia mereka. Monotremata memiliki cici-ciri umum berikut termasuk:
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Endotermik, artinya monotremata menghasilkan panas dari metabolisme dan proses lain di dalam tubuh mereka. Mereka mengatur suhu ini melalui berbagai cara, seringkali melalui morfologi tubuh mereka.
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Permukaan kulit mereka ditutupi rambut, meskipun jumlahnya sangat beragam (misalnya manusia).
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Mereka memberi makan anak mereka melalui susu yang diproduksi oleh organisme dan diekspresikan melalui kelenjar.
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Rahang bawahnya mengandung satu tulang tunggal, bukan banyak tulang seperti yang terlihat pada spesies lain.
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Monotremata memiliki diafragma yang digunakan untuk pernapasan.
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Jantung mereka terbagi menjadi empat kamar.
alt="Image result for Ciri-ciri hewan Monotremata" 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" 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Namun, bertelur bukan satu-satunya perbedaan yang dimiliki monotremata jika dibandingkan dengan hewan mamalia lain. Otak mereka berbeda dari hewan plasenta karena mereka tidak menghubungkan jaringan antara dua belahan otak. Walaupun mereka memiliki tulang rahang tunggal yang mirip dengan mamalia lain, mereka juga memiliki beberapa perbedaan.
Baca juga: Hewan Mamalia – Pengertian, Ciri-Ciri, Contoh Terlengkap
Tulang yang menghubungkan mereka dengan telinga bagian dalam ditempatkan di dalam tengkorak, tetapi mereka memiliki jenis pembukaan yang berbeda. Sementara telinga bekerja dengan cara yang sama, penelitian menunjukkan bahwa monotremata mengembangkan karakteristik ini secara berbeda dari mamalia lain.
Perkembangbiakan monotremata dilakukan dengan cara bertelur mirip dengan reptil, tetapi ini bukan satu-satunya kesamaan yang mereka miliki. Struktur tulang mereka memberi mereka reptil seperti berjalan dan mereka memiliki taji di daerah pergelangan kaki mereka.
Meskipun tidak berfungsi di semua monotremata, satu spesies membawa racun yang ditularkan melalui taji ini.